Opera Ltd (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line	Label	Object Class	Period Type	Balance	Report ElementName
1	000 - Document - Document And Entity Information	Network	*	*	http://www.opera.com/20181231/role/statement-document-and-entity-information
2	Document Information [Table]	Table	*	*	dei:DocumentInformationTable
3	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
4	Entity [Domain]	Member			dei:EntityDomain
5	Document Information [Line Items]	LineItems			dei:DocumentInformationLineItems
6	Entity Registrant Name	Concept (Text/String)	For Period		dei:EntityRegistrantName
7	Entity Central Index Key	Concept (CIK Number)	For Period		dei:EntityCentralIndexKey
8	Trading Symbol	Concept (Text/String)	For Period		dei:TradingSymbol
9	Current Fiscal Year End Date	Concept (Month/Day)	For Period		dei:CurrentFiscalYearEndDate
10	Entity Filer Category	Concept (Filer Category)	For Period		dei:EntityFilerCategory
11	Entity Current Reporting Status	Concept (Yes/No)	For Period		dei:EntityCurrentReportingStatus
12	Entity Voluntary Filers	Concept (Yes/No)	For Period		dei:EntityVoluntaryFilers
13	Entity Well-known Seasoned Issuer	Concept (Yes/No)	For Period		dei:EntityWellKnownSeasonedIssuer
14	Entity Emerging Growth Company	Concept (Yes/No)	For Period		dei:EntityEmergingGrowthCompany
15	Entity Ex Transition Period	Concept (Yes/No)	For Period		dei:EntityExTransitionPeriod
16	Entity Common Stock, Shares Outstanding (in shares)	Concept (Shares)	As Of		dei:EntityCommonStockSharesOutstanding
17	Document Type	Concept (Submission Type)	For Period		dei:DocumentType
18	Document Period End Date	Concept (Date)	For Period		dei:DocumentPeriodEndDate
19	Document Fiscal Year Focus	Concept (Year)	For Period		dei:DocumentFiscalYearFocus
20	Document Fiscal Period Focus	Concept (Fiscal Period)	For Period		dei:DocumentFiscalPeriodFocus
21	Amendment Flag	Concept (Yes/No)	For Period		dei:AmendmentFlag
22	Entity Shell Company	Concept (Yes/No)	For Period		dei:EntityShellCompany
23	001 - Statement - Consolidated Statement of Operations	Network	*	*	http://www.opera.com/20181231/role/statement-consolidated-statement-of-operations
24	Statement Table [Table]	Table	*	*	opra:StatementTable
25	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
26	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
27	Ordinary shares [member]	Member			ifrs-full:OrdinarySharesMember
28	ADS [member]	Member			opra:ADSMember
29	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
30	Entity [Domain]	Member			dei:EntityDomain
31	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
32	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
33	Other income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherIncome
34	Operating expenses	Abstract			opra:OperatingExpenses
35	Cost of revenue	Concept (Monetary)	For Period	Debit	ifrs-full:CostOfSales
36	Personnel expenses including share-based remuneration	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
37	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:DepreciationAndAmortisationExpense
38	Other expenses	Concept (Monetary)	For Period	Debit	ifrs-full:OtherExpenseByNature
39	Restructuring costs	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseOfRestructuringActivities
40	Total operating expenses	Concept (Monetary)	For Period	Debit	ifrs-full:OperatingExpense
41	Operating profit (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossFromOperatingActivities
42	Share of net income (loss) of associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
43	Net finance income (expense)	Abstract			opra:NetFinanceIncomeExpensesAbstract
44	Finance income	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncome
45	Finance expense	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
46	Net foreign exchange gain (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
47	Net finance income (expense)	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncomeCost
48	Net income (loss) before income taxes	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
49	Income tax (expense) benefit for the year	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
50	Net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
51	Net income (loss) attributable to:	Abstract			ifrs-full:ProfitLossAttributableToAbstract
52	Equity holders of the parent	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
53	Non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToNoncontrollingInterests
54	Total net income (loss) attributed	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
55	Basic, US$ (in dollars per share)	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
56	Diluted, US$ (in dollars per share)	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
57	002 - Statement - Consolidated Statement of Comprehensive Income (Loss)	Network	*	*	http://www.opera.com/20181231/role/statement-consolidated-statement-of-comprehensive-income-loss
58	Statement Table [Table]	Table	*	*	opra:StatementTable
59	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
60	Entity [Domain]	Member			dei:EntityDomain
61	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
62	Net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
63	Other comprehensive income (loss) that may be reclassified to Statement of Operations in subsequent periods (net of tax)	Abstract			ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
64	Exchange differences on translation of foreign operations	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationNetOfTax
65	Reclassification of exchange differences on loss of control	Concept (Monetary)	For Period	Debit	ifrs-full:ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax
66	Share of other comprehensive income (loss) of associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax
67	Net other comprehensive income (loss) that may be reclassified to the Statement of Operations in subsequent periods	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax
68	Total comprehensive income (loss), net of tax	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
69	Total comprehensive income (loss) attributable to:	Abstract			ifrs-full:ComprehensiveIncomeAttributableToAbstract
70	Equity holders of the parent	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent
71	Non-controlling interests	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests
72	Total comprehensive income (loss) attributed	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
73	003 - Statement - Consolidated Statement of Financial Position	Network	*	*	http://www.opera.com/20181231/role/statement-consolidated-statement-of-financial-position
74	Statement Table [Table]	Table	*	*	opra:StatementTable
75	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
76	Entity [Domain]	Member			dei:EntityDomain
77	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
78	Non-current assets	Abstract			ifrs-full:NoncurrentAssetsAbstract
79	Furniture, fixtures and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
80	Intangible assets	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsOtherThanGoodwill
81	Goodwill	Concept (Monetary)	As Of	Debit	ifrs-full:Goodwill
82	Investments in associates and joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
83	Other financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherNoncurrentFinancialAssets
84	Deferred tax asset	Concept (Monetary)	As Of	Debit	ifrs-full:DeferredTaxAssets
85	Total non-current assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
86	Current assets	Abstract			ifrs-full:CurrentAssetsAbstract
87	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentTradeReceivables
88	Other receivables	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentReceivables
89	Prepayments	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentPrepayments
90	Other financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:OtherCurrentFinancialAssets
91	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
92	Total current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
93	TOTAL ASSETS	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
94	Equity	Abstract			ifrs-full:EquityAbstract
95	Share capital	Concept (Monetary)	As Of	Credit	ifrs-full:IssuedCapital
96	Other paid in capital	Concept (Monetary)	As Of	Credit	ifrs-full:SharePremium
97	Retained earnings	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
98	Foreign currency translation reserve	Concept (Monetary)	As Of	Credit	ifrs-full:ReserveOfExchangeDifferencesOnTranslation
99	Equity attributed to equity holders of the parent	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAttributableToOwnersOfParent
100	Non-controlling interests	Concept (Monetary)	As Of	Credit	ifrs-full:NoncontrollingInterests
101	Total Equity	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
102	Non-current liabilities	Abstract			ifrs-full:NoncurrentLiabilitiesAbstract
103	Finance lease liabilities and other loans	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinanceLeaseLiabilities
104	Deferred tax liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilities
105	Other non-current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherNoncurrentFinancialLiabilities
106	Total non-current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentLiabilities
107	Current liabilities	Abstract			ifrs-full:CurrentLiabilitiesAbstract
108	Trade and other payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayables
109	Finance lease liabilities and other loans	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinanceLeaseLiabilities
110	Income tax payable	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentTaxLiabilitiesCurrent
111	Deferred revenue	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncomeClassifiedAsCurrent
112	Other current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentFinancialLiabilities
113	Total current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
114	Total liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:Liabilities
115	TOTAL EQUITY AND LIABILITIES	Concept (Monetary)	As Of	Credit	ifrs-full:EquityAndLiabilities
116	004 - Statement - Consolidated Statement of Changes In Equity	Network	*	*	http://www.opera.com/20181231/role/statement-consolidated-statement-of-changes-in-equity
117	Statement Table [Table]	Table	*	*	opra:StatementTable
118	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
119	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
120	Consumer Business [member]	Member			opra:ConsumerBusinessMember
121	Components of equity [axis]	Axis			ifrs-full:ComponentsOfEquityAxis
122	Equity [member]	Member			ifrs-full:EquityMember
123	Issued capital [member]	Member			ifrs-full:IssuedCapitalMember
124	Share premium [member]	Member			ifrs-full:SharePremiumMember
125	Retained earnings [member]	Member			ifrs-full:RetainedEarningsMember
126	Reserve of exchange differences on translation [member]	Member			ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
127	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
128	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
129	Net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
130	Other comprehensive income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
131	Total comprehensive income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
132	Net equity transactions with Otello Corporation ASA	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners
133	hare-based payments	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
134	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
135	Contributed equity	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughOtherContributionsByOwners
136	Impact of new accounting standards (Note 3)	Concept (Monetary)	As Of	Credit	opra:ImpactOfNewAccountingPrincipleInPeriodOfAdoption
137	Beginning balance	Concept (Monetary)	As Of	Credit	opra:EquityAdjustedBalance
138	Business combination with entity under common control (Note 28)	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary
139	Acquisition of treasury shares (Notes 18 and 26)	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughTreasuryShareTransactions
140	005 - Statement - Consolidated Statement of Cash Flows	Network	*	*	http://www.opera.com/20181231/role/statement-consolidated-statement-of-cash-flows
141	Statement Table [Table]	Table	*	*	opra:StatementTable
142	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
143	Entity [Domain]	Member			dei:EntityDomain
144	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
145	Cash flow from operating activities	Abstract			ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
146	Net income (loss) before income taxes	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
147	Income taxes paid	Concept (Monetary)	For Period	Credit	ifrs-full:IncomeTaxesPaidClassifiedAsOperatingActivities
148	Gain on disposal of equipment and intangible assets	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets
149	Depreciation and amortization	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
150	Share of net loss (income) of associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:AdjustmentsForUndistributedProfitsOfAssociates
151	Share-based payment expense	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForSharebasedPayments
152	Change in trade and other receivables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables
153	Change in trade and other payables	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
154	Change in deferred revenue	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInDeferredIncome
155	Change in prepayments	Concept (Monetary)	For Period	Debit	opra:AdjustmentsForIncreaseDecreaseInPrepayments
156	Change in other liabilities	Concept (Monetary)	For Period	Debit	ifrs-full:AdjustmentsForIncreaseDecreaseInOtherLiabilities
157	Other	Concept (Monetary)	For Period	Debit	ifrs-full:OtherAdjustmentsToReconcileProfitLoss
158	Net cash flow from (used in) operating activities	Concept (Monetary)	For Period		ifrs-full:CashFlowsFromUsedInOperatingActivities
159	Cash flow from investment activities	Abstract			ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
160	Proceeds from sales of equipment and intangible assets	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets
161	Purchase of equipment	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
162	Settlement of earnout obligation	Concept (Monetary)	For Period	Credit	opra:PaymentsForSettlementOfEarnoutObligation
163	Receipt of contingent consideration (1)	Concept (Monetary)	For Period	Debit	opra:ProceedsFromContingentConsideration
164	Acquisition of subsidiary, net of cash acquired	Concept (Monetary)	For Period	Credit	ifrs-full:PurchaseOfInterestsInAssociates
165	Release of escrow account	Concept (Monetary)	For Period	Debit	opra:ProceedsFromReleaseOfEscrowAccount
166	Disbursement of short-term loans	Concept (Monetary)	For Period	Credit	opra:DisbursementOfShorttermLoans
167	Investment in, and loans to associates and joint ventures	Concept (Monetary)	For Period	Credit	ifrs-full:CashAdvancesAndLoansMadeToRelatedParties
168	Net proceeds from purchase and sale of listed equity instruments	Concept (Monetary)	For Period	Credit	opra:NetProceedsFromPurchaseAndSaleOfListedEquityInstruments
169	Development expenditure	Concept (Monetary)	For Period	Credit	ifrs-full:CashFlowsUsedInExplorationAndDevelopmentActivities
170	Net cash flow from (used in) investment activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInInvestingActivities
171	Cash flow from financing activities	Abstract			ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
172	Proceeds from issues of equity instruments	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromIssuingShares
173	Transaction costs on issue of equity instruments	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsForShareIssueCosts
174	Acquisition of treasury shares	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsToAcquireOrRedeemEntitysShares
175	Proceeds from loans and borrowings	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
176	Repayment of loans and borrowings	Concept (Monetary)	For Period	Credit	ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
177	Payment of finance lease liabilities	Concept (Monetary)	For Period	Credit	ifrs-full:PaymentsOfFinanceLeaseLiabilitiesClassifiedAsFinancingActivities
178	Net cash flow from (used in) financing activities	Concept (Monetary)	For Period	Debit	ifrs-full:CashFlowsFromUsedInFinancingActivities
179	Net change in cash and cash equivalents	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges
180	Cash and cash equivalents at beginning of period	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
181	Net foreign exchange difference	Concept (Monetary)	For Period	Debit	opra:NetForeignExchangeDifference
182	Cash and cash equivalents at end of period	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
183	006 - Disclosure - Note 1 - Corporate Information	Network	*	*	http://www.opera.com/20181231/role/statement-note-1-corporate-information
184	Statement Table [Table]	Table	*	*	opra:StatementTable
185	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
186	Entity [Domain]	Member			dei:EntityDomain
187	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
188	Disclosure of general information about financial statements [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory
189	007 - Disclosure - Note 2 - Significant Accounting Policies	Network	*	*	http://www.opera.com/20181231/role/statement-note-2-significant-accounting-policies
190	Statement Table [Table]	Table	*	*	opra:StatementTable
191	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
192	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
193	Leasehold improvements [member]	Member			ifrs-full:LeaseholdImprovementsMember
194	Equipment [member]	Member			opra:EquipmentMember
195	Furniture and Fixtures [member]	Member			opra:FurnitureAndFixturesMember
196	Classes of intangible assets other than goodwill [axis]	Axis			ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
197	Intangible assets other than goodwill [member]	Member			ifrs-full:IntangibleAssetsOtherThanGoodwillMember
198	Capitalised development expenditure [member]	Member			ifrs-full:CapitalisedDevelopmentExpenditureMember
199	Technology-based intangible assets [member]	Member			ifrs-full:TechnologybasedIntangibleAssetsMember
200	Customer-related intangible assets [member]	Member			ifrs-full:CustomerrelatedIntangibleAssetsMember
201	Counterparties [axis]	Axis			ifrs-full:CounterpartiesAxis
202	Counterparties [member]	Member			ifrs-full:CounterpartiesMember
203	Yahui Zhou [member]	Member			opra:YahuiZhouMember
204	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
205	Products and services [axis]	Axis			ifrs-full:ProductsAndServicesAxis
206	Products and services [member]	Member			ifrs-full:ProductsAndServicesMember
207	Technology licensing and other revenue [member]	Member			opra:TechnologyLicensingAndOtherRevenueMember
208	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
209	Entity [Domain]	Member			dei:EntityDomain
210	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
211	Disclosure of significant accounting policies [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
212	008 - Disclosure - Note 3 - Changes in Accounting Policies and Disclosures	Network	*	*	http://www.opera.com/20181231/role/statement-note-3-changes-in-accounting-policies-and-disclosures
213	Statement Table [Table]	Table	*	*	opra:StatementTable
214	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
215	Currently stated [member]	Member			ifrs-full:RestatedMember
216	Increase (decrease) due to application of IFRS 15 [member]	Member			ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
217	Increase (decrease) due to application of IFRS 9 [member]	Member			opra:IncreaseDecreaseDueToApplicationOfIFRS9Member
218	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
219	Entity [Domain]	Member			dei:EntityDomain
220	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
221	Disclosure of changes in accounting policies [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfChangesInAccountingPoliciesExplanatory
222	009 - Disclosure - Note 4 - Revenue and Other Income	Network	*	*	http://www.opera.com/20181231/role/statement-note-4-revenue-and-other-income
223	Statement Table [Table]	Table	*	*	opra:StatementTable
224	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
225	Entity [Domain]	Member			dei:EntityDomain
226	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
227	Disclosure of revenue from contracts with customers [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRevenueFromContractsWithCustomersExplanatory
228	010 - Disclosure - Note 5 - Personnel Expenses Including Share-based Remuneration	Network	*	*	http://www.opera.com/20181231/role/statement-note-5-personnel-expenses-including-sharebased-remuneration
229	Statement Table [Table]	Table	*	*	opra:StatementTable
230	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
231	Entity [Domain]	Member			dei:EntityDomain
232	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
233	Disclosure of employee benefits [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEmployeeBenefitsExplanatory
234	011 - Disclosure - Note 6 - Other Expenses	Network	*	*	http://www.opera.com/20181231/role/statement-note-6-other-expenses
235	Statement Table [Table]	Table	*	*	opra:StatementTable
236	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
237	Entity [Domain]	Member			dei:EntityDomain
238	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
239	Disclosure of other expenses [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfOtherExpensesTextBlock
240	012 - Disclosure - Note 7 - Restructuring Costs	Network	*	*	http://www.opera.com/20181231/role/statement-note-7-restructuring-costs
241	Statement Table [Table]	Table	*	*	opra:StatementTable
242	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
243	Entity [Domain]	Member			dei:EntityDomain
244	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
245	Disclosure of restructuring [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfRestructuringTextBlock
246	013 - Disclosure - Note 8 - Furniture, Fixture and Equipment	Network	*	*	http://www.opera.com/20181231/role/statement-note-8-furniture-fixture-and-equipment
247	Statement Table [Table]	Table	*	*	opra:StatementTable
248	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
249	Entity [Domain]	Member			dei:EntityDomain
250	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
251	Disclosure of property, plant and equipment [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
252	014 - Disclosure - Note 9 - Intangible Assets	Network	*	*	http://www.opera.com/20181231/role/statement-note-9-intangible-assets
253	Statement Table [Table]	Table	*	*	opra:StatementTable
254	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
255	Entity [Domain]	Member			dei:EntityDomain
256	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
257	Disclosure of intangible assets [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIntangibleAssetsExplanatory
258	015 - Disclosure - Note 10 - Leases	Network	*	*	http://www.opera.com/20181231/role/statement-note-10-leases
259	Statement Table [Table]	Table	*	*	opra:StatementTable
260	Arrangements involving legal form of lease [axis]	Axis			ifrs-full:ArrangementsInvolvingLegalFormOfLeaseAxis
261	Arrangements involving legal form of lease [member]	Member			ifrs-full:ArrangementsInvolvingLegalFormOfLeaseMember
262	Oslo office lease [member]	Member			opra:OsloOfficeLeaseMember
263	Wroclaw office lease [member]	Member			opra:WroclawOfficeLeaseMember
264	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
265	Entity [Domain]	Member			dei:EntityDomain
266	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
267	Disclosure of leases [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfLeasesExplanatory
268	016 - Disclosure - Note 11 - Finance Lease Liabilities and Other Loans	Network	*	*	http://www.opera.com/20181231/role/statement-note-11-finance-lease-liabilities-and-other-loans
269	Statement Table [Table]	Table	*	*	opra:StatementTable
270	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
271	Entity [Domain]	Member			dei:EntityDomain
272	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
273	Disclosure of borrowings [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBorrowingsExplanatory
274	017 - Disclosure - Note 12 - Other Commitments	Network	*	*	http://www.opera.com/20181231/role/statement-note-12-other-commitments
275	Statement Table [Table]	Table	*	*	opra:StatementTable
276	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
277	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
278	Opera Software AS [member]	Member			opra:OperaSoftwareASMember
279	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
280	Entity [Domain]	Member			dei:EntityDomain
281	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
282	Disclosure of commitments [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCommitmentsExplanatory
283	018 - Disclosure - Note 13 - Guarantees	Network	*	*	http://www.opera.com/20181231/role/statement-note-13-guarantees
284	Statement Table [Table]	Table	*	*	opra:StatementTable
285	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
286	Entity [Domain]	Member			dei:EntityDomain
287	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
288	Guarantees [text block]	Concept (Text Block (HTML))	For Period		opra:GuaranteesTextBlock
289	019 - Disclosure - Note 14 - Other Current Liabilities	Network	*	*	http://www.opera.com/20181231/role/statement-note-14-other-current-liabilities
290	Statement Table [Table]	Table	*	*	opra:StatementTable
291	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
292	Entity [Domain]	Member			dei:EntityDomain
293	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
294	Disclosure of other current liabilities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherCurrentLiabilitiesExplanatory
295	020 - Disclosure - Note 15 - Financial Assets and Liabilities	Network	*	*	http://www.opera.com/20181231/role/statement-note-15-financial-assets-and-liabilities
296	Statement Table [Table]	Table	*	*	opra:StatementTable
297	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
298	Entity [Domain]	Member			dei:EntityDomain
299	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
300	Disclosure of financial instruments [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
301	021 - Disclosure - Note 16 - Scheduled of Maturities of Financial Liabilities	Network	*	*	http://www.opera.com/20181231/role/statement-note-16-scheduled-of-maturities-of-financial-liabilities
302	Statement Table [Table]	Table	*	*	opra:StatementTable
303	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
304	Entity [Domain]	Member			dei:EntityDomain
305	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
306	Disclosure of maturity analysis for non-derivative financial liabilities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:MaturityAnalysisForNonderivativeFinancialLiabilities
307	022 - Disclosure - Note 17 - Financial Risk Management	Network	*	*	http://www.opera.com/20181231/role/statement-note-17-financial-risk-management
308	Statement Table [Table]	Table	*	*	opra:StatementTable
309	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
310	Risks [member]	Member			ifrs-full:TypesOfRisksMember
311	Equity price risk [member]	Member			ifrs-full:EquityPriceRiskMember
312	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
313	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
314	Equity investments [member]	Member			ifrs-full:EquityInvestmentsMember
315	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
316	Entity [Domain]	Member			dei:EntityDomain
317	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
318	Disclosure of financial risk management [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
319	023 - Disclosure - Note 18 - Capital Management	Network	*	*	http://www.opera.com/20181231/role/statement-note-18-capital-management
320	Statement Table [Table]	Table	*	*	opra:StatementTable
321	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
322	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
323	ADS [member]	Member			opra:ADSMember
324	Counterparties [axis]	Axis			ifrs-full:CounterpartiesAxis
325	Counterparties [member]	Member			ifrs-full:CounterpartiesMember
326	Private investors [member]	Member			opra:PrivateInvestorsMember
327	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
328	Entity [Domain]	Member			dei:EntityDomain
329	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
330	Disclosure of capital management [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfCapitalManagementTextBlock
331	024 - Disclosure - Note 19 - Cash and Cash Equivalents	Network	*	*	http://www.opera.com/20181231/role/statement-note-19-cash-and-cash-equivalents
332	Statement Table [Table]	Table	*	*	opra:StatementTable
333	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
334	Entity [Domain]	Member			dei:EntityDomain
335	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
336	Disclosure of cash and cash equivalents [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
337	025 - Disclosure - Note 20 - Trade Receivables, Prepayments and Other Receivables	Network	*	*	http://www.opera.com/20181231/role/statement-note-20-trade-receivables-prepayments-and-other-receivables
338	Statement Table [Table]	Table	*	*	opra:StatementTable
339	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
340	Currently stated [member]	Member			ifrs-full:RestatedMember
341	Increase (decrease) due to application of IFRS 9 [member]	Member			opra:IncreaseDecreaseDueToApplicationOfIFRS9Member
342	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
343	Entity [Domain]	Member			dei:EntityDomain
344	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
345	Disclosure of trade and other receivables [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
346	026 - Disclosure - Note 21 - Trade and Other Payables	Network	*	*	http://www.opera.com/20181231/role/statement-note-21-trade-and-other-payables
347	Statement Table [Table]	Table	*	*	opra:StatementTable
348	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
349	Entity [Domain]	Member			dei:EntityDomain
350	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
351	Disclosure of trade and other payables [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTradeAndOtherPayablesExplanatory
352	027 - Disclosure - Note 22 - Finance Income and Expenses	Network	*	*	http://www.opera.com/20181231/role/statement-note-22-finance-income-and-expenses
353	Statement Table [Table]	Table	*	*	opra:StatementTable
354	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
355	Entity [Domain]	Member			dei:EntityDomain
356	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
357	Disclosure of finance income (cost) [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
358	028 - Disclosure - Note 23 - Changes in Liabilities Arising From Financing Activities	Network	*	*	http://www.opera.com/20181231/role/statement-note-23-changes-in-liabilities-arising-from-financing-activities
359	Statement Table [Table]	Table	*	*	opra:StatementTable
360	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
361	Entity [Domain]	Member			dei:EntityDomain
362	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
363	Disclosure of information that enables users of financial statements to evaluate changes in liabilities arising from financing activities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInformationThatEnablesUsersOfFinancialStatementsToEvaluateChangesInLiabilitiesArisingFromFinancingActivitiesExplanatory
364	029 - Disclosure - Note 24 - Income Tax (Expense) Benefit	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit
365	Statement Table [Table]	Table	*	*	opra:StatementTable
366	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
367	Entity [Domain]	Member			dei:EntityDomain
368	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
369	Disclosure of income tax [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfIncomeTaxExplanatory
370	030 - Disclosure - Note 25 - Share-based Payments	Network	*	*	http://www.opera.com/20181231/role/statement-note-25-sharebased-payments
371	Statement Table [Table]	Table	*	*	opra:StatementTable
372	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
373	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
374	RSU [member]	Member			opra:RSUMember
375	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
376	Entity [Domain]	Member			dei:EntityDomain
377	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
378	Disclosure of share-based payment arrangements [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
379	031 - Disclosure - Note 26 - Shareholders and Share Capital	Network	*	*	http://www.opera.com/20181231/role/statement-note-26-shareholders-and-share-capital
380	Statement Table [Table]	Table	*	*	opra:StatementTable
381	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
382	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
383	ADS [member]	Member			opra:ADSMember
384	Ordinary shares [member]	Member			ifrs-full:OrdinarySharesMember
385	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
386	Entity [Domain]	Member			dei:EntityDomain
387	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
388	Shareholders [text block]	Concept (Text Block (HTML))	For Period		opra:ShareholdersTextBlock
389	032 - Disclosure - Note 27 - Group Entities	Network	*	*	http://www.opera.com/20181231/role/statement-note-27-group-entities
390	Statement Table [Table]	Table	*	*	opra:StatementTable
391	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
392	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
393	Opera Software Iceland [member]	Member			opra:OperaSoftwareIcelandMember
394	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
395	Entity [Domain]	Member			dei:EntityDomain
396	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
397	Disclosure of subsidiaries [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
398	033 - Disclosure - Note 28 - Business Combinations	Network	*	*	http://www.opera.com/20181231/role/statement-note-28-business-combinations
399	Statement Table [Table]	Table	*	*	opra:StatementTable
400	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
401	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
402	TenSpot Pesa Limited [member]	Member			opra:TenSpotPesaLimitedMember
403	Beijing Kunlun Tech [member]	Member			opra:BeijingKunlunTechMember
404	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
405	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
406	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
407	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
408	Entity [Domain]	Member			dei:EntityDomain
409	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
410	Disclosure of business combinations [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfBusinessCombinationsExplanatory
411	034 - Disclosure - Note 29 - Investments in Associates and Joint Ventures	Network	*	*	http://www.opera.com/20181231/role/statement-note-29-investments-in-associates-and-joint-ventures
412	Statement Table [Table]	Table	*	*	opra:StatementTable
413	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
414	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
415	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
416	StarMaker Inc. [member]	Member			opra:StarmakerIncMember
417	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
418	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
419	Acquisition of OKash [member]	Member			opra:AcquisitionOfOKashMember
420	TenSpot Pesa Limited [member]	Member			opra:TenSpotPesaLimitedMember
421	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
422	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
423	nHorizon [member]	Member			opra:nHorizonMember
424	Powerbets Holdings Limited [member]	Member			opra:PowerbetsHoldingsLimitedMember
425	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
426	Entity [Domain]	Member			dei:EntityDomain
427	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
428	Disclosure of interests in other entities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInOtherEntitiesExplanatory
429	035 - Disclosure - Note 30 - Related Parties	Network	*	*	http://www.opera.com/20181231/role/statement-note-30-related-parties
430	Statement Table [Table]	Table	*	*	opra:StatementTable
431	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
432	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
433	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
434	Joint control over Powerbets [member]	Member			opra:JointControlOverPowerbetsMember
435	Investment in StarMaker [member]	Member			opra:InvestmentInStarmakerMember
436	Acquisition of OKash from Opay [member]	Member			opra:AcquisitionOfOKashFromOpayMember
437	Services provided and received to related parties [member]	Member			opra:ServicesProvidedAndReceivedToRelatedPartiesMember
438	Prepayments to 360 Mobile Security [member]	Member			opra:PrepaymentsTo360MobileSecurityMember
439	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
440	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
441	Acquisition of OKash [member]	Member			opra:AcquisitionOfOKashMember
442	Range [axis]	Axis			ifrs-full:RangeAxis
443	Ranges [member]	Member			ifrs-full:RangesMember
444	Bottom of range [member]	Member			ifrs-full:BottomOfRangeMember
445	Top of range [member]	Member			ifrs-full:TopOfRangeMember
446	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
447	Entity [Domain]	Member			dei:EntityDomain
448	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
449	Disclosure of related party [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfRelatedPartyExplanatory
450	036 - Disclosure - Note 31 - Net Income (Loss) Per Share	Network	*	*	http://www.opera.com/20181231/role/statement-note-31-net-income-loss-per-share
451	Statement Table [Table]	Table	*	*	opra:StatementTable
452	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
453	Entity [Domain]	Member			dei:EntityDomain
454	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
455	Earnings per share [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:EarningsPerShareExplanatory
456	037 - Disclosure - Note 32 - Events After the Reporting Period	Network	*	*	http://www.opera.com/20181231/role/statement-note-32-events-after-the-reporting-period
457	Statement Table [Table]	Table	*	*	opra:StatementTable
458	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
459	Non-adjusting events after reporting period [member]	Member			ifrs-full:NonadjustingEventsMember
460	Potential ordinary share transactions [member]	Member			ifrs-full:PotentialOrdinaryShareTransactionsMember
461	Entering into significant commitments or contingent liabilities [member]	Member			ifrs-full:EnteringIntoSignificantCommitmentsOrContingentLiabilitiesMember
462	RSUs were exchanged for an equivalent number of ADSs [member]	Member			opra:RsusWereExchangedForAnEquivalentNumberOfAdssMember
463	Major ordinary share transactions [member]	Member			ifrs-full:MajorOrdinaryShareTransactionsMember
464	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
465	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
466	Amended and restated share incentive plan [member]	Member			opra:AmendedAndRestatedShareIncentivePlanMember
467	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
468	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
469	ADS [member]	Member			opra:ADSMember
470	Ordinary shares of Opera Limited [member]	Member			opra:OrdinarySharesOfOperaLimitedMember
471	Types of contracts [axis]	Axis			ifrs-full:TypesOfContractsAxis
472	Types of contracts [member]	Member			ifrs-full:TypesOfContractsMember
473	Lease agreement for Oslo headquarters [Member]	Member			opra:LeaseAgreementForOsloHeadquartersMember
474	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
475	Entity [Domain]	Member			dei:EntityDomain
476	Kunlun Tech Limited [member]	Member			opra:KunlunTechLimitedMember
477	Counterparty Name [Axis]	Axis			srt:CounterpartyNameAxis
478	Counterparty Name [Domain]	Member			srt:RepurchaseAgreementCounterpartyNameDomain
479	Golden Brick [member]	Member			opra:GoldenBrickMember
480	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
481	Disclosure of events after reporting period [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEventsAfterReportingPeriodExplanatory
482	038 - Disclosure - Significant Accounting Policies (Policies)	Network	*	*	http://www.opera.com/20181231/role/statement-significant-accounting-policies-policies
483	Statement Table [Table]	Table	*	*	opra:StatementTable
484	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
485	Entity [Domain]	Member			dei:EntityDomain
486	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
487	Discloure of Significant Accounting Policies	Abstract			opra:DisclosureOfSignificantAccountingPoliciesAbstract
488	Description of accounting policy for basis of preparation of successor and predecessor [text block]	Concept (Text Block (HTML))	For Period		opra:DescriptionOfAccountingPolicyForBasisOfPreparationOfSuccessorAndPredecessorTextBlock
489	Description of accounting policy for consolidation [text block]	Concept (Text Block (HTML))	For Period		opra:DescriptionOfAccountingPolicyForConsolidationTextBlock
490	Description of accounting policy for foreign currency translation [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
491	Description of accounting policy for investment in associates and joint ventures [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory
492	Description of accounting policy for business combinations [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory
493	Description of accounting policy for property, plant and equipment [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
494	Description of accounting policy for intangible assets other than goodwill [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory
495	Description of accounting policy for leases [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForLeasesExplanatory
496	Description of accounting policy for financial assets [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialAssetsExplanatory
497	Description of accounting policy for financial liabilities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory
498	Description of accounting policy for impairment of assets [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory
499	Description of accounting policy for fair value measurement [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory
500	Description of accounting policy for provisions [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
501	Description of accounting policy for recognition of revenue [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForRecognitionOfRevenue
502	Description of accounting policy for other income [text block]	Concept (Text Block (HTML))	For Period		opra:DescriptionOfAccountingPolicyForOtherIncomeTextBlock
503	Description of accounting policy for expenses [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForExpensesExplanatory
504	Description of accounting policy for income tax [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForIncomeTaxExplanatory
505	Description of accounting policy for government grants [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForGovernmentGrants
506	Description of accounting policy for treasury shares [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DescriptionOfAccountingPolicyForTreasurySharesExplanatory
507	Description of accounting policy for significant accounting estimates, judgements and assumptions [text block]	Concept (Text Block (HTML))	For Period		opra:DescriptionOfAccountingPolicyForSignificantAccountingEstimatesJudgementsAndAssumptionsTextBlock
508	039 - Disclosure - Note 3 - Changes in Accounting Policies and Disclosures (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-3-changes-in-accounting-policies-and-disclosures-tables
509	Statement Table [Table]	Table	*	*	opra:StatementTable
510	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
511	Entity [Domain]	Member			dei:EntityDomain
512	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
513	Effect of new accounting standard adoption [text block]	Concept (Text Block (HTML))	For Period		opra:EffectOfNewAccountingStandardAdoptionTextBlock
514	040 - Disclosure - Note 4 - Revenue and Other Income (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-4-revenue-and-other-income-tables
515	Statement Table [Table]	Table	*	*	opra:StatementTable
516	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
517	Entity [Domain]	Member			dei:EntityDomain
518	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
519	Disclosure of disaggregation of revenue from contracts with customers [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersExplanatory
520	Disclosure of other operating income [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfOtherOperatingIncomeExplanatory
521	041 - Disclosure - Note 5 - Personnel Expenses Including Share-based Remuneration (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-5-personnel-expenses-including-sharebased-remuneration-tables
522	Statement Table [Table]	Table	*	*	opra:StatementTable
523	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
524	Entity [Domain]	Member			dei:EntityDomain
525	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
526	Disclosure of personnel expenses including share-based remuneration [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfPersonnelExpensesIncludingSharebasedRemunerationTextBlock
527	Disclosure of research and development expense [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfResearchAndDevelopmentExpenseExplanatory
528	Disclosure of information about key management personnel [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
529	042 - Disclosure - Note 6 - Other Expenses (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-6-other-expenses-tables
530	Statement Table [Table]	Table	*	*	opra:StatementTable
531	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
532	Entity [Domain]	Member			dei:EntityDomain
533	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
534	Disclosure of other expenses by nature [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfOtherExpensesByNatureTextBlock
535	043 - Disclosure - Note 7 - Restructuring Costs (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-7-restructuring-costs-tables
536	Statement Table [Table]	Table	*	*	opra:StatementTable
537	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
538	Entity [Domain]	Member			dei:EntityDomain
539	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
540	Disclosure of restructuring costs [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfRestructuringCostsTextBlock
541	044 - Disclosure - Note 8 - Furniture, Fixture and Equipment (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-8-furniture-fixture-and-equipment-tables
542	Statement Table [Table]	Table	*	*	opra:StatementTable
543	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
544	Entity [Domain]	Member			dei:EntityDomain
545	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
546	Disclosure of detailed information about property, plant and equipment [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
547	Disclosure of detailed information about the estimated useful lives of property, plant and equipment [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfDetailedInformationAboutTheEstimatedUsefulLivesOfPropertyPlantAndEquipmentTextBlock
548	045 - Disclosure - Note 9 - Intangible Assets (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-9-intangible-assets-tables
549	Statement Table [Table]	Table	*	*	opra:StatementTable
550	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
551	Entity [Domain]	Member			dei:EntityDomain
552	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
553	Disclosure of detailed information about intangible assets [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
554	Disclosure of intangible assets with indefinite and definite useful life [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfIntangibleAssetsWithIndefiniteAndDefiniteUsefulLifeExplanatory
555	046 - Disclosure - Note 10 - Leases (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-10-leases-tables
556	Statement Table [Table]	Table	*	*	opra:StatementTable
557	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
558	Entity [Domain]	Member			dei:EntityDomain
559	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
560	Disclosure of operating lease by lessee [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfOperatingLeaseByLesseeExplanatory
561	Disclosure of finance lease by lessee [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfFinanceLeaseByLesseeExplanatory
562	047 - Disclosure - Note 11 - Finance Lease Liabilities and Other Loans (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-11-finance-lease-liabilities-and-other-loans-tables
563	Statement Table [Table]	Table	*	*	opra:StatementTable
564	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
565	Entity [Domain]	Member			dei:EntityDomain
566	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
567	Disclosure of detailed information about borrowings [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsExplanatory
568	Disclosure of borrowings and finance lease liabilities [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfBorrowingsAndFinanceLeaseLiabilitiesTextBlock
569	048 - Disclosure - Note 14 - Other Current Liabilities (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-14-other-current-liabilities-tables
570	Statement Table [Table]	Table	*	*	opra:StatementTable
571	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
572	Entity [Domain]	Member			dei:EntityDomain
573	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
574	Disclosure of detailed information about other current liabilities [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfDetailedInformationAboutOtherCurrentLiabilitiesTextBlock
575	049 - Disclosure - Note 15 - Financial Assets and Liabilities (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-15-financial-assets-and-liabilities-tables
576	Statement Table [Table]	Table	*	*	opra:StatementTable
577	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
578	Entity [Domain]	Member			dei:EntityDomain
579	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
580	Disclosure of detailed information about financial instruments [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfDetailedInformationAboutFinancialInstrumentsExplanatory
581	Disclosure of gain (loss) on trading securities [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfGainLossOnTradingSecuritiesExplanatory
582	Disclosure of financial instruments fair value hierarchy [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfFinancialInstrumentsFairValueHierarchyExplanatory
583	050 - Disclosure - Note 16 - Scheduled of Maturities of Financial Liabilities (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-16-scheduled-of-maturities-of-financial-liabilities-tables
584	Statement Table [Table]	Table	*	*	opra:StatementTable
585	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
586	Entity [Domain]	Member			dei:EntityDomain
587	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
588	Disclosure of financial liabilities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinancialLiabilitiesExplanatory
589	051 - Disclosure - Note 19 - Cash and Cash Equivalents (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-19-cash-and-cash-equivalents-tables
590	Statement Table [Table]	Table	*	*	opra:StatementTable
591	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
592	Entity [Domain]	Member			dei:EntityDomain
593	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
594	Disclosure of cash, cash equivalents, and restricted cash [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfCashCashEquivalentsAndRestrictedCashTextBlock
595	052 - Disclosure - Note 20 - Trade Receivables, Prepayments and Other Receivables (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-20-trade-receivables-prepayments-and-other-receivables-tables
596	Statement Table [Table]	Table	*	*	opra:StatementTable
597	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
598	Entity [Domain]	Member			dei:EntityDomain
599	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
600	Disclosure of trade receivables, prepayments and other receivables [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfTradeReceivablesPrepaymentsAndOtherReceivablesTextBlock
601	Provision for impairment of trade receivables [text block]	Concept (Text Block (HTML))	For Period		opra:ProvisionForImpairmentOfTradeReceivablesTextBlock
602	Disclosure of aging of trade receivables [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfAgingOfTradeReceivablesExplanatory
603	053 - Disclosure - Note 21 - Trade and Other Payables (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-21-trade-and-other-payables-tables
604	Statement Table [Table]	Table	*	*	opra:StatementTable
605	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
606	Entity [Domain]	Member			dei:EntityDomain
607	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
608	Disclosure of detailed information about trade and other payables [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfDetailedInformationAboutTradeAndOtherPayablesTextBlock
609	054 - Disclosure - Note 22 - Finance Income and Expenses (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-22-finance-income-and-expenses-tables
610	Statement Table [Table]	Table	*	*	opra:StatementTable
611	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
612	Entity [Domain]	Member			dei:EntityDomain
613	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
614	Disclosure of finance income [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinanceIncomeExplanatory
615	Disclosure of finance cost [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfFinanceCostExplanatory
616	Disclosure of effect of changes in foreign exchange rates [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory
617	055 - Disclosure - Note 23 - Changes in Liabilities Arising From Financing Activities (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-23-changes-in-liabilities-arising-from-financing-activities-tables
618	Statement Table [Table]	Table	*	*	opra:StatementTable
619	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
620	Entity [Domain]	Member			dei:EntityDomain
621	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
622	Disclosure of reconciliation of liabilities arising from financing activities [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesExplanatory
623	056 - Disclosure - Note 24 - Income Tax (Expense) Benefit (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit-tables
624	Statement Table [Table]	Table	*	*	opra:StatementTable
625	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
626	Entity [Domain]	Member			dei:EntityDomain
627	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
628	Major components of tax expense (income) [text block]	Concept (Text Block (HTML))	For Period		opra:MajorComponentsOfTaxExpenseIncomeTextBlock
629	Reconciliation of accounting profit multiplied by applicable tax rates [text block]	Concept (Text Block (HTML))	For Period		opra:ReconciliationOfAccountingProfitMultipliedByApplicableTaxRatesTextBlock
630	Disclosure of temporary difference, unused tax losses and unused tax credits [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
631	Disclosure of changes in deferred taxes [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfChangesInDeferredTaxesTextBlock
632	057 - Disclosure - Note 25 - Share-based Payments (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-25-sharebased-payments-tables
633	Statement Table [Table]	Table	*	*	opra:StatementTable
634	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
635	Entity [Domain]	Member			dei:EntityDomain
636	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
637	Explanation of effect of share-based payments on entity's profit or loss [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:ExplanationOfEffectOfSharebasedPaymentsOnProfitOrLoss
638	Disclosure of number and weighted average exercise prices of other equity instruments [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfOtherEquityInstrumentsExplanatory
639	Disclosure of indirect measurement of fair value of goods or services received, other equity instrument granted during period [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedOtherEquityInstrumentGrantedDuringPeriodTextBlock
640	058 - Disclosure - Note 26 - Shareholders and Share Capital (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-26-shareholders-and-share-capital-tables
641	Statement Table [Table]	Table	*	*	opra:StatementTable
642	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
643	Entity [Domain]	Member			dei:EntityDomain
644	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
645	Disclosure of shareholders' ownership interest [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfShareholdersOwnershipInterestTextBlock
646	059 - Disclosure - Note 27 - Group Entities (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-27-group-entities-tables
647	Statement Table [Table]	Table	*	*	opra:StatementTable
648	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
649	Entity [Domain]	Member			dei:EntityDomain
650	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
651	Disclosure of interests in subsidiaries [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfInterestsInSubsidiariesExplanatory
652	060 - Disclosure - Note 29 - Investments in Associates and Joint Ventures (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-29-investments-in-associates-and-joint-ventures-tables
653	Statement Table [Table]	Table	*	*	opra:StatementTable
654	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
655	Entity [Domain]	Member			dei:EntityDomain
656	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
657	Disclosure of detailed information about selected financial information [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfDetailedInformationAboutSelectedFinancialInformationTextBlock
658	Disclosure of carrying amounts of investments in associates and joint ventures [text block]	Concept (Text Block (HTML))	For Period		opra:DisclosureOfCarryingAmountsOfInvestmentsInAssociatesAndJointVenturesTextBlock
659	061 - Disclosure - Note 30 - Related Parties (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-30-related-parties-tables
660	Statement Table [Table]	Table	*	*	opra:StatementTable
661	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
662	Entity [Domain]	Member			dei:EntityDomain
663	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
664	Disclosure of transactions between related parties [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfTransactionsBetweenRelatedPartiesExplanatory
665	062 - Disclosure - Note 31 - Net Income (Loss) Per Share (Tables)	Network	*	*	http://www.opera.com/20181231/role/statement-note-31-net-income-loss-per-share-tables
666	Statement Table [Table]	Table	*	*	opra:StatementTable
667	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
668	Entity [Domain]	Member			dei:EntityDomain
669	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
670	Disclosure of earnings per share [text block]	Concept (Text Block (HTML))	For Period		ifrs-full:DisclosureOfEarningsPerShareExplanatory
671	063 - Disclosure - Note 2 - Significant Accounting Policies (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-2-significant-accounting-policies-details-textual
672	Statement Table [Table]	Table	*	*	opra:StatementTable
673	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
674	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
675	Leasehold improvements [member]	Member			ifrs-full:LeaseholdImprovementsMember
676	Equipment [member]	Member			opra:EquipmentMember
677	Furniture and Fixtures [member]	Member			opra:FurnitureAndFixturesMember
678	Classes of intangible assets other than goodwill [axis]	Axis			ifrs-full:ClassesOfIntangibleAssetsOtherThanGoodwillAxis
679	Intangible assets other than goodwill [member]	Member			ifrs-full:IntangibleAssetsOtherThanGoodwillMember
680	Capitalised development expenditure [member]	Member			ifrs-full:CapitalisedDevelopmentExpenditureMember
681	Technology-based intangible assets [member]	Member			ifrs-full:TechnologybasedIntangibleAssetsMember
682	Customer-related intangible assets [member]	Member			ifrs-full:CustomerrelatedIntangibleAssetsMember
683	Counterparties [axis]	Axis			ifrs-full:CounterpartiesAxis
684	Counterparties [member]	Member			ifrs-full:CounterpartiesMember
685	Yahui Zhou [member]	Member			opra:YahuiZhouMember
686	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
687	Products and services [axis]	Axis			ifrs-full:ProductsAndServicesAxis
688	Products and services [member]	Member			ifrs-full:ProductsAndServicesMember
689	Technology licensing and other revenue [member]	Member			opra:TechnologyLicensingAndOtherRevenueMember
690	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
691	Entity [Domain]	Member			dei:EntityDomain
692	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
693	Useful lives or depreciation rates, property, plant and equipment	Concept (Text/String)	For Period		ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
694	Useful lives or amortisation rates, intangible assets other than goodwill	Concept (Text/String)	For Period		ifrs-full:UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
695	Proportion of voting rights in Beijing Kunlun Tech Co. Ltd. held by a counterparty	Concept (Percent)	For Period		opra:ProportionOfVotingRightsInBeijingKunlunTechCoLtdHeldByACounterparty
696	Total revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
697	Trade receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeReceivables
698	064 - Disclosure - Note 3 - Changes in Accounting Policies and Disclosures (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-3-changes-in-accounting-policies-and-disclosures-details-textual
699	Statement Table [Table]	Table	*	*	opra:StatementTable
700	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
701	Currently stated [member]	Member			ifrs-full:RestatedMember
702	Increase (decrease) due to application of IFRS 15 [member]	Member			ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
703	Increase (decrease) due to application of IFRS 9 [member]	Member			opra:IncreaseDecreaseDueToApplicationOfIFRS9Member
704	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
705	Entity [Domain]	Member			dei:EntityDomain
706	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
707	Retained earnings	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
708	Total provisions	Concept (Monetary)	As Of	Credit	ifrs-full:Provisions
709	065 - Disclosure - Note 3 - Change in Accounting Policies and Disclosures - Adoption of New Accounting Standard (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-3-change-in-accounting-policies-and-disclosures-adoption-of-new-accounting-standard-details
710	Statement Table [Table]	Table	*	*	opra:StatementTable
711	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
712	Currently stated [member]	Member			ifrs-full:RestatedMember
713	Previously stated [member]	Member			ifrs-full:PreviouslyStatedMember
714	Increase (decrease) due to application of IFRS 15 [member]	Member			ifrs-full:IncreaseDecreaseDueToApplicationOfIFRS15Member
715	Increase (decrease) due to application of IFRS 16 [member]	Member			opra:IncreaseDecreaseDueToApplicationOfIfrs16Member
716	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
717	Non-adjusting events after reporting period [member]	Member			ifrs-full:NonadjustingEventsMember
718	Change in accounting policies [member]	Member			opra:ChangeInAccountingPoliciesMember
719	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
720	Entity [Domain]	Member			dei:EntityDomain
721	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
722	Deferred tax asset	Concept (Monetary)	As Of	Debit	ifrs-full:DeferredTaxAssets
723	Deferred revenue	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredIncome
724	Retained earnings	Concept (Monetary)	As Of	Credit	ifrs-full:RetainedEarnings
725	Furniture, fixtures and equipment	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
726	Finance lease liabilities and other loans - non-current	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinanceLeaseLiabilities
727	Finance lease liabilities and other loans - current	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinanceLeaseLiabilities
728	Other liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentFinancialLiabilities
729	Net impact on equity	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
730	066 - Disclosure - Note 4 - Revenue and Other Income - Revenue (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-4-revenue-and-other-income-revenue-details
731	Statement Table [Table]	Table	*	*	opra:StatementTable
732	Geographical areas [axis]	Axis			ifrs-full:GeographicalAreasAxis
733	Geographical areas [member]	Member			ifrs-full:GeographicalAreasMember
734	Ireland [member]	Member			opra:Ireland1Member
735	RUSSIAN FEDERATION	Member			country:RU
736	Other geographical areas [member]	Member			opra:OtherGeographicalAreasMember
737	Major customers [axis]	Axis			ifrs-full:MajorCustomersAxis
738	Customers [member]	Member			ifrs-full:MajorCustomersMember
739	Customer group 1 [member]	Member			opra:CustomerGroup1Member
740	Customer group 2 [member]	Member			opra:CustomerGroup2Member
741	Products and services [axis]	Axis			ifrs-full:ProductsAndServicesAxis
742	Products and services [member]	Member			ifrs-full:ProductsAndServicesMember
743	Search [member]	Member			opra:SearchMember
744	Advertising [member]	Member			opra:AdvertisingMember
745	Retail [member]	Member			opra:RetailMember
746	Technology licensing and other [member]	Member			opra:TechnologyLicensingAndOtherMember
747	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
748	Entity [Domain]	Member			dei:EntityDomain
749	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
750	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromContractsWithCustomers
751	067 - Disclosure - Note 4 - Revenue and Other Income - Other Income (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-4-revenue-and-other-income-other-income-details
752	Statement Table [Table]	Table	*	*	opra:StatementTable
753	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
754	Entity [Domain]	Member			dei:EntityDomain
755	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
756	Proceeds allocated to divestment of IP	Concept (Monetary)	For Period	Credit	opra:ProceedsAllocatedToDivestmentOfIP
757	Cost of technology license obtained from	Concept (Monetary)	For Period	Debit	opra:CostOfTechnologyLicenseObtainedFrom
758	Otello Corporation ASA	Concept (Monetary)	For Period	Debit	opra:CostRelatedToRelatedPartyTransaction
759	Book value of associated capitalized development costs	Concept (Monetary)	For Period	Debit	opra:BookValueOfAssociatedCapitalizedDevelopmentCosts
760	Legal fees related to the divestment process	Concept (Monetary)	For Period	Debit	opra:LegalFeesRelatedToTheDivestmentProcess
761	Total	Concept (Monetary)	For Period	Credit	ifrs-full:OtherIncome
762	068 - Disclosure - Note 5 - Personnel Expenses Including Share-based Remuneration (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-5-personnel-expenses-including-sharebased-remuneration-details-textual
763	Statement Table [Table]	Table	*	*	opra:StatementTable
764	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
765	Entity [Domain]	Member			dei:EntityDomain
766	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
767	Key management personnel compensation, share-based payment	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
768	069 - Disclosure - Note 5 - Personnel Expenses Including Share-based Remuneration - Personnel Expenses (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-5-personnel-expenses-including-sharebased-remuneration-personnel-expenses-details
769	Statement Table [Table]	Table	*	*	opra:StatementTable
770	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
771	Entity [Domain]	Member			dei:EntityDomain
772	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
773	Salaries including bonuses	Concept (Monetary)	For Period	Debit	ifrs-full:WagesAndSalaries
774	Social security cost, excluding amounts related to share-based remuneration	Concept (Monetary)	For Period	Debit	ifrs-full:SocialSecurityContributions
775	External temporary hires	Concept (Monetary)	For Period	Debit	opra:ExternalTemporaryHires
776	Defined-contribution pension cost	Concept (Monetary)	For Period	Debit	ifrs-full:PostemploymentBenefitExpenseDefinedContributionPlans
777	Other personnel related expenses	Concept (Monetary)	For Period	Debit	ifrs-full:OtherEmployeeExpense
778	Personnel expenses excluding share-based remuneration	Concept (Monetary)	For Period	Debit	opra:PersonnelExpensesExcludingSharebasedRemuneration
779	Share-based remuneration, including related social security costs	Concept (Monetary)	For Period	Debit	opra:SharebasedRemunerationIncludingRelatedSocialSecurityCosts
780	Total	Concept (Monetary)	For Period	Debit	ifrs-full:EmployeeBenefitsExpense
781	070 - Disclosure - Note 5 - Personnel Expenses Including Share-based Remuneration - Research and Development Expenditure (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-5-personnel-expenses-including-sharebased-remuneration-research-and-development-expenditure-details
782	Statement Table [Table]	Table	*	*	opra:StatementTable
783	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
784	Entity [Domain]	Member			dei:EntityDomain
785	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
786	Total research and development expenditure	Concept (Monetary)	For Period	Debit	ifrs-full:ResearchAndDevelopmentExpense
787	Less: Capitalized development expenditure excluded from personnel expenses	Concept (Monetary)	For Period	Debit	opra:CapitalizedDevelopmentExpenditureExcludedFromPersonnelExpenses
788	Net expensed research and development expenditure	Concept (Monetary)	For Period	Debit	opra:NetExpensedResearchAndDevelopmentExpenditure
789	071 - Disclosure - Note 5 - Personnel Expenses Including Share-based Remuneration - Compensation of Key Management Personnel (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-5-personnel-expenses-including-sharebased-remuneration-compensation-of-key-management-personnel-details
790	Statement Table [Table]	Table	*	*	opra:StatementTable
791	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
792	Entity [Domain]	Member			dei:EntityDomain
793	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
794	Short-term employee benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
795	Post-employment and medical benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationPostemploymentBenefits
796	Termination benefits	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationTerminationBenefits
797	Share-based payment transactions	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
798	Total	Concept (Monetary)	For Period	Debit	ifrs-full:KeyManagementPersonnelCompensation
799	072 - Disclosure - Note 6 - Other Expenses - Other Expenses (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-6-other-expenses-other-expenses-details
800	Statement Table [Table]	Table	*	*	opra:StatementTable
801	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
802	Entity [Domain]	Member			dei:EntityDomain
803	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
804	Marketing and distribution	Concept (Monetary)	For Period	Debit	ifrs-full:SalesAndMarketingExpense
805	Hosting	Concept (Monetary)	For Period	Debit	opra:HostingExpenses
806	Audit, legal and other advisory services	Concept (Monetary)	For Period	Debit	ifrs-full:ProfessionalFeesExpense
807	Software license fees	Concept (Monetary)	For Period	Debit	opra:SoftwareLicenseFees
808	Rent and other office expenses	Concept (Monetary)	For Period	Debit	ifrs-full:RentalExpense
809	Travel	Concept (Monetary)	For Period	Debit	ifrs-full:TravelExpense
810	Other	Concept (Monetary)	For Period	Debit	ifrs-full:MiscellaneousOtherOperatingExpense
811	Total	Concept (Monetary)	For Period	Debit	ifrs-full:OtherExpenseByNature
812	073 - Disclosure - Note 7 - Restructuring Costs - Restructuring Costs (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-7-restructuring-costs-restructuring-costs-details
813	Statement Table [Table]	Table	*	*	opra:StatementTable
814	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
815	Entity [Domain]	Member			dei:EntityDomain
816	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
817	Severance cost	Concept (Monetary)	For Period	Debit	opra:SeveranceCosts
818	Office restructuring cost	Concept (Monetary)	For Period	Debit	opra:OfficeRestructuringCosts
819	Legal fees related to restructuring	Concept (Monetary)	For Period	Debit	opra:LegalFeesRelatedToRestructuring
820	Total	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseOfRestructuringActivities
821	074 - Disclosure - Note 8 - Furniture, Fixture and Equipment - Components of Property, Plant and Equipment, Net (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-8-furniture-fixture-and-equipment-components-of-property-plant-and-equipment-net-details
822	Statement Table [Table]	Table	*	*	opra:StatementTable
823	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
824	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
825	Gross carrying amount [member]	Member			ifrs-full:GrossCarryingAmountMember
826	Accumulated depreciation, amortisation and impairment [member]	Member			ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
827	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
828	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
829	Furniture and Fixtures [member]	Member			opra:FurnitureAndFixturesMember
830	Equipment [member]	Member			opra:EquipmentMember
831	Leasehold improvements [member]	Member			ifrs-full:LeaseholdImprovementsMember
832	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
833	Entity [Domain]	Member			dei:EntityDomain
834	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
835	Beginning of the year	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
836	Additions	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
837	Disposals	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsPropertyPlantAndEquipment
838	Exchange rate differences	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment
839	Depreciation for the year	Concept (Monetary)	For Period		ifrs-full:DepreciationPropertyPlantAndEquipment
840	End of the year	Concept (Monetary)	As Of	Debit	ifrs-full:PropertyPlantAndEquipment
841	075 - Disclosure - Note 8 - Furniture, Fixture and Equipment - Estimated Useful Lives of Property, Plant and Equipment (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-8-furniture-fixture-and-equipment-estimated-useful-lives-of-property-plant-and-equipment-details
842	Statement Table [Table]	Table	*	*	opra:StatementTable
843	Classes of property, plant and equipment [axis]	Axis			ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
844	Property, plant and equipment [member]	Member			ifrs-full:PropertyPlantAndEquipmentMember
845	Furniture and Fixtures [member]	Member			opra:FurnitureAndFixturesMember
846	Equipment [member]	Member			opra:EquipmentMember
847	Leasehold improvements [member]	Member			ifrs-full:LeaseholdImprovementsMember
848	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
849	Entity [Domain]	Member			dei:EntityDomain
850	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
851	Useful life	Concept (Text/String)	For Period		ifrs-full:UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
852	076 - Disclosure - Note 9 - Intangible Assets (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-9-intangible-assets-details-textual
853	Statement Table [Table]	Table	*	*	opra:StatementTable
854	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
855	Entity [Domain]	Member			dei:EntityDomain
856	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
857	Number of major business segments	Concept (Integer)	For Period		opra:NumberOfMajorBusinessSegments
858	Recoverable amount of asset or cash-generating unit	Concept (Monetary)	As Of	Debit	ifrs-full:RecoverableAmountOfAssetOrCashgeneratingUnit
859	Risk-free rate, significant unobservable inputs, assets	Concept (Percent)	For Period		opra:RiskFreeRateSignificantUnobservableInputsAssets
860	Market risk premium rate, ignificant unobservable inputs, assets	Concept (Percent)	For Period		opra:MarketRiskPremiumRateIgnificantUnobservableInputsAssets
861	Estimated beta for equity	Concept (Decimal)	For Period		opra:EstimatedBetaForEquity
862	Cost of debt after tax, percent	Concept (Percent)	For Period		opra:CostOfDebtAfterTaxPercent
863	Equity to total capital, percent	Concept (Percent)	For Period		opra:EquityToTotalCapitalPercent
864	Weighted average cost of capital, significant unobservable inputs, assets	Concept (Percent)	For Period		ifrs-full:WeightedAverageCostOfCapitalSignificantUnobservableInputsAssets
865	Cash generating unit, nominal growth rate	Concept (Percent)	For Period		opra:CashGeneratingUnitNominalGrowthRate
866	Sensitivity analysis, reasonably possible increase (decrease) in revenue	Concept (Percent)	For Period		opra:SensitivityAnalysisReasonablyPossibleIncreaseDecreaseInRevenue
867	Sensitivity analysis, reasonably possible increase (decrease) in operating expenditure	Concept (Percent)	For Period		opra:SensitivityAnalysisReasonablyPossibleIncreaseDecreaseInOperatingExpenditure
868	Sensitivity analysis, reasonably possible increase (decrease) in WACC	Concept (Percent)	For Period		opra:SensitivityAnalysisReasonablyPossibleIncreaseDecreaseInWACC
869	077 - Disclosure - Note 9 - Intangible Assets - Intangible Assets (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-9-intangible-assets-intangible-assets-details
870	Statement Table [Table]	Table	*	*	opra:StatementTable
871	Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]	Axis			ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
872	Carrying amount [member]	Member			ifrs-full:CarryingAmountMember
873	Gross carrying amount [member]	Member			ifrs-full:GrossCarryingAmountMember
874	Accumulated depreciation, amortisation and impairment [member]	Member			ifrs-full:AccumulatedDepreciationAmortisationAndImpairmentMember
875	Classes of intangible assets and goodwill [axis]	Axis			ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
876	Intangible assets and goodwill [member]	Member			ifrs-full:IntangibleAssetsAndGoodwillMember
877	Goodwill [member]	Member			ifrs-full:GoodwillMember
878	Customer-related intangible assets [member]	Member			ifrs-full:CustomerrelatedIntangibleAssetsMember
879	Technology-based intangible assets [member]	Member			ifrs-full:TechnologybasedIntangibleAssetsMember
880	Trademarks [member]	Member			opra:TrademarksMember
881	Other intangible assets [member]	Member			ifrs-full:OtherIntangibleAssetsMember
882	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
883	Entity [Domain]	Member			dei:EntityDomain
884	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
885	Beginning of the year	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsAndGoodwill
886	Additions (1)	Concept (Monetary)	For Period	Debit	ifrs-full:AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
887	Disposals	Concept (Monetary)	For Period	Credit	ifrs-full:DisposalsIntangibleAssetsOtherThanGoodwill
888	Exchange differences	Concept (Monetary)	For Period	Debit	ifrs-full:IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill
889	Amortization for the year	Concept (Monetary)	For Period		ifrs-full:AmortisationIntangibleAssetsOtherThanGoodwill
890	End of the year	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsAndGoodwill
891	078 - Disclosure - Note 9 - Intangible Assets - Useful Life of Intangible Assets (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-9-intangible-assets-useful-life-of-intangible-assets-details
892	Statement Table [Table]	Table	*	*	opra:StatementTable
893	Classes of intangible assets and goodwill [axis]	Axis			ifrs-full:ClassesOfIntangibleAssetsAndGoodwillAxis
894	Intangible assets and goodwill [member]	Member			ifrs-full:IntangibleAssetsAndGoodwillMember
895	Goodwill [member]	Member			ifrs-full:GoodwillMember
896	Customer-related intangible assets [member]	Member			ifrs-full:CustomerrelatedIntangibleAssetsMember
897	Technology-based intangible assets [member]	Member			ifrs-full:TechnologybasedIntangibleAssetsMember
898	Trademarks [member]	Member			opra:TrademarksMember
899	Other intangible assets [member]	Member			ifrs-full:OtherIntangibleAssetsMember
900	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
901	Entity [Domain]	Member			dei:EntityDomain
902	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
903	Useful life	Concept (Text/String)	For Period		ifrs-full:DescriptionAndCarryingAmountOfIntangibleAssetsWithIndefiniteUsefulLife
904	Useful life (Year)	Concept (xbrli:durationItemType)	For Period		opra:FiniteLivedIntangibleAssetUsefulLife
905	079 - Disclosure - Note 10 - Leases (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-10-leases-details-textual
906	Statement Table [Table]	Table	*	*	opra:StatementTable
907	Arrangements involving legal form of lease [axis]	Axis			ifrs-full:ArrangementsInvolvingLegalFormOfLeaseAxis
908	Arrangements involving legal form of lease [member]	Member			ifrs-full:ArrangementsInvolvingLegalFormOfLeaseMember
909	Oslo office lease [member]	Member			opra:OsloOfficeLeaseMember
910	Wroclaw office lease [member]	Member			opra:WroclawOfficeLeaseMember
911	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
912	Entity [Domain]	Member			dei:EntityDomain
913	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
914	Minimum lease payments payable under non-cancellable operating lease	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
915	Expected future minimum sublease payments receivable under non-cancellable subleases, classified as operating lease	Concept (Monetary)	As Of	Debit	ifrs-full:ExpectedFutureMinimumSubleasePaymentsReceivableUnderNoncancellableSubleasesClassifiedAsOperatingLease
916	Lease termination period	Concept (xbrli:durationItemType)	For Period		opra:LeaseTerminationPeriod
917	Financial assets pledged as collateral for liabilities or contingent liabilities	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
918	080 - Disclosure - Note 10 - Leases - Operating Leases (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-10-leases-operating-leases-details
919	Statement Table [Table]	Table	*	*	opra:StatementTable
920	Maturity [axis]	Axis			ifrs-full:MaturityAxis
921	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
922	Not later than one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
923	Later than one year and not later than five years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
924	Later than five years [member]	Member			ifrs-full:LaterThanFiveYearsMember
925	Arrangements involving legal form of lease [axis]	Axis			ifrs-full:ArrangementsInvolvingLegalFormOfLeaseAxis
926	Arrangements involving legal form of lease [member]	Member			ifrs-full:ArrangementsInvolvingLegalFormOfLeaseMember
927	Office lease [member]	Member			opra:OfficeLeaseMember
928	Date center lease [member]	Member			opra:DateCenterLeaseMember
929	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
930	Entity [Domain]	Member			dei:EntityDomain
931	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
932	Leasing costs expensed	Concept (Monetary)	For Period	Debit	ifrs-full:LeaseAndSubleasePaymentsRecognisedAsExpense
933	Operating leases due	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
934	081 - Disclosure - Note 10 - Leases - Finance Leases (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-10-leases-finance-leases-details
935	Statement Table [Table]	Table	*	*	opra:StatementTable
936	Maturity [axis]	Axis			ifrs-full:MaturityAxis
937	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
938	Not later than one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
939	Later than one year and not later than five years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanFiveYearsMember
940	Later than five years [member]	Member			ifrs-full:LaterThanFiveYearsMember
941	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
942	Entity [Domain]	Member			dei:EntityDomain
943	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
944	Present value of minimum lease payments	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumFinanceLeasePaymentsPayableAtPresentValue
945	Interest	Concept (Monetary)	As Of	Credit	ifrs-full:FutureFinanceChargeOnFinanceLease
946	Future minimum lease payments	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumFinanceLeasePaymentsPayable
947	082 - Disclosure - Note 11 - Finance Lease Liabilities and Other Loans - Finance Lease Liabilities and Other Loans (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-11-finance-lease-liabilities-and-other-loans-finance-lease-liabilities-and-other-loans-details
948	Statement Table [Table]	Table	*	*	opra:StatementTable
949	Classes of liabilities [axis]	Axis			ifrs-full:ClassesOfLiabilitiesAxis
950	Liabilities [member]	Member			ifrs-full:LiabilitiesMember
951	Interest bearing loans [member]	Member			opra:InterestBearingLoansMember
952	Range [axis]	Axis			ifrs-full:RangeAxis
953	Ranges [member]	Member			ifrs-full:RangesMember
954	Bottom of range [member]	Member			ifrs-full:BottomOfRangeMember
955	Top of range [member]	Member			ifrs-full:TopOfRangeMember
956	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
957	Entity [Domain]	Member			dei:EntityDomain
958	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
959	Interest rate	Concept (Percent)	As Of		ifrs-full:BorrowingsInterestRate
960	Maturity	Concept (Text/String)	For Period		ifrs-full:BorrowingsMaturity
961	Outstanding	Concept (Monetary)	As Of	Credit	ifrs-full:Borrowings
962	083 - Disclosure - Note 11 - Finance Lease Liabilities and Other Loans - Noncurrent and Current (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-11-finance-lease-liabilities-and-other-loans-noncurrent-and-current-details
963	Statement Table [Table]	Table	*	*	opra:StatementTable
964	Classes of liabilities [axis]	Axis			ifrs-full:ClassesOfLiabilitiesAxis
965	Liabilities [member]	Member			ifrs-full:LiabilitiesMember
966	Finance leases [member]	Member			opra:FinanceLeasesMember
967	Interest bearing loans [member]	Member			opra:InterestBearingLoansMember
968	Other loans [member]	Member			opra:OtherLoansMember
969	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
970	Entity [Domain]	Member			dei:EntityDomain
971	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
972	Non-current portion	Concept (Monetary)	As Of	Credit	ifrs-full:LongtermBorrowings
973	Current portion	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
974	084 - Disclosure - Note 12 - Other Commitments (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-12-other-commitments-details-textual
975	Statement Table [Table]	Table	*	*	opra:StatementTable
976	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
977	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
978	Opera Software AS [member]	Member			opra:OperaSoftwareASMember
979	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
980	Entity [Domain]	Member			dei:EntityDomain
981	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
982	Contingent liabilities recognised in business combination at end of period	Concept (Monetary)	As Of	Credit	ifrs-full:ContingentLiabilitiesRecognisedInBusinessCombination
983	Liabilities incurred	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesIncurred
984	Settled liabilities, contingent liabilities recognised in business combination	Concept (Monetary)	For Period	Debit	ifrs-full:SettledLiabilitiesContingentLiabilitiesRecognisedInBusinessCombination
985	085 - Disclosure - Note 13 - Guarantees (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-13-guarantees-details-textual
986	Statement Table [Table]	Table	*	*	opra:StatementTable
987	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
988	Entity [Domain]	Member			dei:EntityDomain
989	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
990	Finance lease liabilities, guarantee	Concept (Monetary)	As Of	Credit	opra:FinanceLeaseLiabilitiesGuarantee
991	Finance lease liabilities, guarantee term	Concept (xbrli:durationItemType)	For Period		opra:FinanceLeaseLiabilitiesGuaranteeTerm
992	086 - Disclosure - Note 14 - Other Current Liabilities - Other Current Liabilities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-14-other-current-liabilities-other-current-liabilities-details
993	Statement Table [Table]	Table	*	*	opra:StatementTable
994	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
995	Entity [Domain]	Member			dei:EntityDomain
996	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
997	Accrued personnel expenses	Concept (Monetary)	As Of	Credit	opra:CurrentAccruedPersonnelExpenses
998	Trading liability (1)	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
999	Unsettled trades (1)	Concept (Monetary)	As Of	Credit	opra:CurrentUnsettledTrades
1000	Other current liabilities	Concept (Monetary)	As Of	Credit	opra:OtherCurrentMiscellaneousLiabilities
1001	Total	Concept (Monetary)	As Of	Credit	ifrs-full:OtherCurrentFinancialLiabilities
1002	087 - Disclosure - Note 15 - Financial Assets and Liabilities (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-15-financial-assets-and-liabilities-details-textual
1003	Statement Table [Table]	Table	*	*	opra:StatementTable
1004	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1005	Entity [Domain]	Member			dei:EntityDomain
1006	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1007	Long-term growth rate, significant unobservable inputs, entity's own equity instruments	Concept (Percent)	For Period		opra:LongtermGrowthRateSignificantUnobservableInputsEntitysOwnEquityInstruments
1008	Long-term EBITDA margin, significant unobservable inputs, entity's own equity instruments	Concept (Percent)	For Period		opra:LongtermEbitdaMarginSignificantUnobservableInputsEntitysOwnEquityInstruments
1009	Weighted average cost of capital, significant unobservable inputs, entity's own equity instruments	Concept (Percent)	For Period		ifrs-full:WeightedAverageCostOfCapitalSignificantUnobservableInputsEntitysOwnEquityInstruments
1010	Fair value of preferred shares increase, if long-term growth increased by 1 percentage or EBITDA margin incresed by 2 percentage	Concept (Monetary)	For Period	Credit	opra:FairValueOfPreferredSharesIncreaseIfLongtermGrowthIncreasedBy1PercentageOrEbitdaMarginIncresedBy2Percentage
1011	Fair value of preferred shares increase, if cost of capital reduced by 1 percentage	Concept (Monetary)	For Period	Credit	opra:FairValueOfPreferredSharesIncreaseIfCostOfCapitalReducedBy1Percentage
1012	Financial assets, at fair value	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsAtFairValue
1013	088 - Disclosure - Note 15 - Financial Assets and Liabilities - Financial Assets and Liabilities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-15-financial-assets-and-liabilities-financial-assets-and-liabilities-details
1014	Statement Table [Table]	Table	*	*	opra:StatementTable
1015	Categories of financial assets [axis]	Axis			ifrs-full:CategoriesOfFinancialAssetsAxis
1016	Financial assets, category [member]	Member			ifrs-full:FinancialAssetsCategoryMember
1017	Financial assets at fair value through profit or loss, category [member]	Member			ifrs-full:FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
1018	Financial assets at amortised cost, category [member]	Member			ifrs-full:FinancialAssetsAtAmortisedCostCategoryMember
1019	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
1020	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
1021	Other financial assets [member]	Member			opra:OtherFinancialAssetsMember
1022	Investment in associate (preferred shares in StarMaker) [member]	Member			opra:InvestmentInAssociatePreferredSharesInStarmakerMember
1023	Trade receivables [member]	Member			ifrs-full:TradeReceivablesMember
1024	Other receivables [member]	Member			opra:OtherReceivablesMember
1025	Categories of financial liabilities [axis]	Axis			ifrs-full:CategoriesOfFinancialLiabilitiesAxis
1026	Financial liabilities, category [member]	Member			ifrs-full:FinancialLiabilitiesCategoryMember
1027	Financial liabilities at fair value through profit or loss, category [member]	Member			ifrs-full:FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
1028	Financial liabilities at amortised cost, category [member]	Member			ifrs-full:FinancialLiabilitiesAtAmortisedCostCategoryMember
1029	Classes of financial liabilities [axis]	Axis			ifrs-full:ClassesOfFinancialLiabilitiesAxis
1030	Financial liabilities, class [member]	Member			ifrs-full:FinancialLiabilitiesMember
1031	Financial lease liabilities and other loans [member]	Member			opra:FinancialLeaseLiabilitiesAndOtherLoansMember
1032	Other noncurrent liabilities [member]	Member			opra:OtherNoncurrentLiabilitiesMember
1033	Trade and other payables [member]	Member			opra:TradeAndOtherPayablesMember
1034	Other current liabilities [member]	Member			opra:OtherCurrentLiabilitiesMember
1035	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1036	Entity [Domain]	Member			dei:EntityDomain
1037	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1038	Non-current financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentFinancialAssets
1039	Current financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentFinancialAssets
1040	Financial assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
1041	Non-current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinancialLiabilities
1042	Current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
1043	Financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilities
1044	089 - Disclosure - Note 15 - Financial Assets and Liabilities - Gain (Loss) on Trading Securities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-15-financial-assets-and-liabilities-gain-loss-on-trading-securities-details
1045	Statement Table [Table]	Table	*	*	opra:StatementTable
1046	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
1047	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
1048	Long position trading securities [member]	Member			opra:LongPositionTradingSecuritiesMember
1049	Short position trading securities [member]	Member			opra:ShortPositionTradingSecuritiesMember
1050	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1051	Entity [Domain]	Member			dei:EntityDomain
1052	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1053	Realized gain (loss)	Concept (Monetary)	For Period	Credit	opra:RealizedGainLossOnTradingSecurities
1054	Unrealized gain (loss)	Concept (Monetary)	For Period	Credit	opra:UnrealizedGainLossOnTradingSecurities
1055	Long positions	Concept (Monetary)	For Period	Credit	opra:GainLossOnTradingSecurities
1056	090 - Disclosure - Note 15 - Financial Assets and Liabilities - Fair Value Hierarchy (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-15-financial-assets-and-liabilities-fair-value-hierarchy-details
1057	Statement Table [Table]	Table	*	*	opra:StatementTable
1058	Measurement [axis]	Axis			ifrs-full:MeasurementAxis
1059	Aggregated measurement [member]	Member			ifrs-full:AggregatedMeasurementMember
1060	Not measured at fair value in statement of financial position but for which fair value is disclosed [member]	Member			ifrs-full:NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember
1061	At fair value [member]	Member			ifrs-full:AtFairValueMember
1062	Classes of financial liabilities [axis]	Axis			ifrs-full:ClassesOfFinancialLiabilitiesAxis
1063	Financial liabilities, class [member]	Member			ifrs-full:FinancialLiabilitiesMember
1064	Contingent consideration [member]	Member			opra:ContingentConsiderationMember
1065	Other liabilities [member]	Member			opra:OtherLiabilitiesMember
1066	Financial lease liabilities and other loans [member]	Member			opra:FinancialLeaseLiabilitiesAndOtherLoansMember
1067	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
1068	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
1069	Other financial assets [member]	Member			opra:OtherFinancialAssetsMember
1070	Investment in associate [member]	Member			opra:InvestmentInAssociateMember
1071	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1072	Entity [Domain]	Member			dei:EntityDomain
1073	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1074	Fair value of liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:FinancialLiabilitiesAtFairValue
1075	Fair value of assets	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsAtFairValue
1076	091 - Disclosure - Note 16 - Schedule of Maturities of Financial Liabilities - Financial Liabilities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-16-schedule-of-maturities-of-financial-liabilities-financial-liabilities-details
1077	Statement Table [Table]	Table	*	*	opra:StatementTable
1078	Maturity [axis]	Axis			ifrs-full:MaturityAxis
1079	Aggregated time bands [member]	Member			ifrs-full:AggregatedTimeBandsMember
1080	Not later than one year [member]	Member			ifrs-full:NotLaterThanOneYearMember
1081	Later than one year and not later than three years [member]	Member			ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1082	Later than three years [member]	Member			ifrs-full:LaterThanThreeYearsMember
1083	Classes of financial liabilities [axis]	Axis			ifrs-full:ClassesOfFinancialLiabilitiesAxis
1084	Financial liabilities, class [member]	Member			ifrs-full:FinancialLiabilitiesMember
1085	Financial lease liabilities and other loans [member]	Member			opra:FinancialLeaseLiabilitiesAndOtherLoansMember
1086	Other liabilities [member]	Member			opra:OtherLiabilitiesMember
1087	Trade and other payables [member]	Member			opra:TradeAndOtherPayablesMember
1088	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1089	Entity [Domain]	Member			dei:EntityDomain
1090	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1091	Non-current financial liabilities, including interest	Concept (Monetary)	As Of	Credit	opra:NoncurrentFinancialLiabilitiesIncludingInterest
1092	Non-current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentFinancialLiabilities
1093	Current financial liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentFinancialLiabilities
1094	Current financial liabilities, including interest	Concept (Monetary)	As Of	Credit	opra:CurrentFinancialLiabilitiesIncludingInterest
1095	Total financial liabilities including interest	Concept (Monetary)	As Of	Credit	opra:FinancialLiabilitiesIncludingInterest
1096	092 - Disclosure - Note 17 - Financial Risk Management (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-17-financial-risk-management-details-textual
1097	Statement Table [Table]	Table	*	*	opra:StatementTable
1098	Types of risks [axis]	Axis			ifrs-full:TypesOfRisksAxis
1099	Risks [member]	Member			ifrs-full:TypesOfRisksMember
1100	Equity price risk [member]	Member			ifrs-full:EquityPriceRiskMember
1101	Classes of financial assets [axis]	Axis			ifrs-full:ClassesOfFinancialAssetsAxis
1102	Financial assets, class [member]	Member			ifrs-full:FinancialAssetsMember
1103	Equity investments [member]	Member			ifrs-full:EquityInvestmentsMember
1104	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1105	Entity [Domain]	Member			dei:EntityDomain
1106	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1107	Initial capital allocation	Concept (Monetary)	As Of		opra:InitialCapitalAllocation
1108	Financial assets at end of period	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssets
1109	Gain (loss) on change in fair value of hedging instrument used as basis for recognising hedge ineffectiveness	Concept (Monetary)	For Period	Credit	ifrs-full:GainLossOnChangeInFairValueOfHedgingInstrumentUsedAsBasisForRecognisingHedgeIneffectiveness
1110	093 - Disclosure - Note 18 - Capital Management (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-18-capital-management-details-textual
1111	Statement Table [Table]	Table	*	*	opra:StatementTable
1112	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
1113	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
1114	ADS [member]	Member			opra:ADSMember
1115	Counterparties [axis]	Axis			ifrs-full:CounterpartiesAxis
1116	Counterparties [member]	Member			ifrs-full:CounterpartiesMember
1117	Private investors [member]	Member			opra:PrivateInvestorsMember
1118	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1119	Entity [Domain]	Member			dei:EntityDomain
1120	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1121	Proceeds from issuing shares	Concept (Monetary)	For Period	Debit	ifrs-full:ProceedsFromIssuingShares
1122	Total cash and cash equivalents	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1123	Repurchase program, share authorized	Concept (Shares)	As Of		opra:RepurchaseProgramShareAuthorized
1124	Number of share repurcahsed	Concept (Shares)	For Period		opra:NumberOfShareRepurcahsed
1125	Purchase of treasury shares	Concept (Monetary)	For Period	Debit	ifrs-full:PurchaseOfTreasuryShares
1126	Purchase of treasury shares, Net	Concept (Monetary)	For Period	Debit	opra:PurchaseOfTreasurySharesNet
1127	094 - Disclosure - Note 19 - Cash and Cash Equivalents - Cash and Cash Equivalents (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-19-cash-and-cash-equivalents-cash-and-cash-equivalents-details
1128	Statement Table [Table]	Table	*	*	opra:StatementTable
1129	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1130	Entity [Domain]	Member			dei:EntityDomain
1131	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1132	Restricted cash	Concept (Monetary)	As Of	Debit	ifrs-full:RestrictedCashAndCashEquivalents
1133	Cash and cash equivalents	Concept (Monetary)	As Of	Debit	opra:CashAndCashEquivalentsExcludingRestrictedCash
1134	Total	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalents
1135	095 - Disclosure - Note 20 - Trade Receivables, Prepayments and Other Receivables (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-20-trade-receivables-prepayments-and-other-receivables-details-textual
1136	Statement Table [Table]	Table	*	*	opra:StatementTable
1137	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
1138	Currently stated [member]	Member			ifrs-full:RestatedMember
1139	Increase (decrease) due to application of IFRS 9 [member]	Member			opra:IncreaseDecreaseDueToApplicationOfIFRS9Member
1140	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1141	Entity [Domain]	Member			dei:EntityDomain
1142	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1143	Trade receivables, loss allowance	Concept (Monetary)	As Of	Credit	opra:TradeReceivablesLossAllowance
1144	Allowance of trade receivables, percentage	Concept (Percent)	As Of		opra:AllowanceOfTradeReceivablesPercentage
1145	Total provisions	Concept (Monetary)	As Of	Credit	ifrs-full:Provisions
1146	096 - Disclosure - Note 20 - Trade Receivables, Prepayments and Other Receivables - Trade Receivables, Prepayments and Other Receivables (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-20-trade-receivables-prepayments-and-other-receivables-trade-receivables-prepayments-and-other-receivables-details
1147	Statement Table [Table]	Table	*	*	opra:StatementTable
1148	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1149	Entity [Domain]	Member			dei:EntityDomain
1150	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1151	Trade receivables	Concept (Monetary)	As Of	Debit	opra:TradeReceivablesExcludingUnbilledReceivables
1152	Unbilled receivables	Concept (Monetary)	As Of	Debit	opra:UnbilledReceivables
1153	Total	Concept (Monetary)	As Of	Debit	ifrs-full:TradeReceivables
1154	VAT	Concept (Monetary)	As Of	Debit	ifrs-full:ValueAddedTaxReceivables
1155	Related party receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherReceivablesDueFromRelatedParties
1156	Escrow account pledged as loan for joint venture	Concept (Monetary)	As Of	Debit	opra:EscrowAccountPledgedAsLoanForJointVenture
1157	Other	Concept (Monetary)	As Of	Debit	opra:MiscellaneousOtherReceivable
1158	Total	Concept (Monetary)	As Of	Debit	ifrs-full:OtherReceivables
1159	Prepaid expenses (1)	Concept (Monetary)	As Of	Debit	opra:PrepaidExpenses
1160	Total	Concept (Monetary)	As Of	Debit	ifrs-full:Prepayments
1161	097 - Disclosure - Note 20 - Trade Receivables, Prepayments and Other Receivables - Provision for Impairment of Trade Receivables (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-20-trade-receivables-prepayments-and-other-receivables-provision-for-impairment-of-trade-receivables-details
1162	Statement Table [Table]	Table	*	*	opra:StatementTable
1163	Classes of other provisions [axis]	Axis			ifrs-full:ClassesOfProvisionsAxis
1164	Other provisions [member]	Member			ifrs-full:OtherProvisionsMember
1165	Provision for impairment of trade receivables [member]	Member			opra:ProvisionForImpairmentOfTradeReceivablesMember
1166	Retrospective application and retrospective restatement [axis]	Axis			ifrs-full:RetrospectiveApplicationAndRetrospectiveRestatementAxis
1167	Currently stated [member]	Member			ifrs-full:RestatedMember
1168	Previously stated [member]	Member			ifrs-full:PreviouslyStatedMember
1169	Increase (decrease) due to application of IFRS 9 [member]	Member			opra:IncreaseDecreaseDueToApplicationOfIFRS9Member
1170	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1171	Entity [Domain]	Member			dei:EntityDomain
1172	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1173	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:OtherProvisions
1174	Change in the period	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesOtherProvisions
1175	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:OtherProvisions
1176	098 - Disclosure - Note 20 - Trade Receivables, Prepayments and Other Receivables - Aging of Trade Receivables (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-20-trade-receivables-prepayments-and-other-receivables-aging-of-trade-receivables-details
1177	Statement Table [Table]	Table	*	*	opra:StatementTable
1178	Past due status [axis]	Axis			ifrs-full:PastDueStatusAxis
1179	Past due status [member]	Member			ifrs-full:PastDueStatusMember
1180	Current [member]	Member			ifrs-full:CurrentMember
1181	Later than one month and not later than two months [member]	Member			ifrs-full:LaterThanOneMonthAndNotLaterThanTwoMonthsMember
1182	Later than two months and not later than three months [member]	Member			ifrs-full:LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
1183	Later than three months [member]	Member			ifrs-full:LaterThanThreeMonthsMember
1184	More than three months [member]	Member			opra:MoreThanThreeMonthsMember
1185	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1186	Entity [Domain]	Member			dei:EntityDomain
1187	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1188	Aging analysis of trade receivables	Concept (Monetary)	As Of	Debit	opra:TradeReceivablesExcludingUnbilledReceivables
1189	099 - Disclosure - Note 21 - Trade and Other Payables - Trade and Other Payables (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-21-trade-and-other-payables-trade-and-other-payables-details
1190	Statement Table [Table]	Table	*	*	opra:StatementTable
1191	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1192	Entity [Domain]	Member			dei:EntityDomain
1193	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1194	Trade payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesToTradeSuppliers
1195	Sales tax payables	Concept (Monetary)	As Of	Credit	opra:SalesTaxPayables
1196	Employee withholding tax	Concept (Monetary)	As Of	Credit	opra:EmployeeWithholdingTaxPayables
1197	VAT	Concept (Monetary)	As Of	Credit	ifrs-full:ValueAddedTaxPayables
1198	Payroll tax (1)	Concept (Monetary)	As Of	Credit	opra:PayrollTaxPayables
1199	Total	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayables
1200	100 - Disclosure - Note 22 - Finance Income and Expenses - Finance Income (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-22-finance-income-and-expenses-finance-income-details
1201	Statement Table [Table]	Table	*	*	opra:StatementTable
1202	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1203	Entity [Domain]	Member			dei:EntityDomain
1204	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1205	Interest income	Concept (Monetary)	For Period	Credit	ifrs-full:RevenueFromInterest
1206	Other finance income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherFinanceIncome
1207	Total	Concept (Monetary)	For Period	Credit	ifrs-full:FinanceIncome
1208	101 - Disclosure - Note 22 - Finance Income and Expenses - Finance Expenses (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-22-finance-income-and-expenses-finance-expenses-details
1209	Statement Table [Table]	Table	*	*	opra:StatementTable
1210	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1211	Entity [Domain]	Member			dei:EntityDomain
1212	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1213	Interest expense	Concept (Monetary)	For Period	Debit	ifrs-full:InterestExpense
1214	Other financial cost	Concept (Monetary)	For Period	Debit	ifrs-full:OtherFinanceCost
1215	Decrease in fair value financial instruments (1)	Concept (Monetary)	For Period	Debit	opra:DecreaseInFairValueFinancialInstruments
1216	Total	Concept (Monetary)	For Period	Debit	ifrs-full:FinanceCosts
1217	102 - Disclosure - Note 22 - Finance Income and Expenses - Foreign Exchange Gain (Loss) (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-22-finance-income-and-expenses-foreign-exchange-gain-loss-details
1218	Statement Table [Table]	Table	*	*	opra:StatementTable
1219	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1220	Entity [Domain]	Member			dei:EntityDomain
1221	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1222	Unrealized foreign exchange gain (loss)	Concept (Monetary)	For Period	Credit	opra:UnrealizedForeignExchangeGainLoss
1223	Realized foreign exchange gain (loss)	Concept (Monetary)	For Period	Credit	opra:RealizedForeignExchangeGainLoss
1224	Total	Concept (Monetary)	For Period	Credit	ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
1225	103 - Disclosure - Note 23 - Changes in Liabilities Arising From Financing Activities - Changes in Liabilities Arising From Financing Activities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-23-changes-in-liabilities-arising-from-financing-activities-changes-in-liabilities-arising-from-financing-activities-details
1226	Statement Table [Table]	Table	*	*	opra:StatementTable
1227	Liabilities arising from financing activities [axis]	Axis			ifrs-full:LiabilitiesArisingFromFinancingActivitiesAxis
1228	Liabilities arising from financing activities [member]	Member			ifrs-full:LiabilitiesArisingFromFinancingActivitiesMember
1229	Interest-bearing loans and liabilities, non-current [member]	Member			opra:InterestbearingLoansAndLiabilitiesNoncurrentMember
1230	Finance lease liabilities, non-current [member]	Member			opra:FinanceLeaseLiabilitiesNoncurrentMember
1231	Interest bearing loans and liabilities, current [member]	Member			opra:InterestBearingLoansAndLiabilitiesCurrentMember
1232	Finance lease liabilities, current [member]	Member			opra:FinanceLeaseLiabilitiesCurrentMember
1233	Other loans [member]	Member			opra:OtherLoansMember
1234	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1235	Entity [Domain]	Member			dei:EntityDomain
1236	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1237	Beginning balance	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesArisingFromFinancingActivities
1238	Cash flows	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities
1239	Foreign exchange movement	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities
1240	New liabilities	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities
1241	Other	Concept (Monetary)	For Period	Credit	ifrs-full:IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities
1242	Ending balance	Concept (Monetary)	As Of	Credit	ifrs-full:LiabilitiesArisingFromFinancingActivities
1243	104 - Disclosure - Note 24 - Income Tax (Expense) Benefit (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit-details-textual
1244	Statement Table [Table]	Table	*	*	opra:StatementTable
1245	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1246	Entity [Domain]	Member			dei:EntityDomain
1247	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1248	Applicable tax rate	Concept (Percent)	For Period		ifrs-full:ApplicableTaxRate
1249	105 - Disclosure - Note 24 - Income Tax (Expense) Benefit - Summary of Income Tax (Expense) Benefit (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit-summary-of-income-tax-expense-benefit-details
1250	Statement Table [Table]	Table	*	*	opra:StatementTable
1251	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1252	Entity [Domain]	Member			dei:EntityDomain
1253	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1254	Current income taxes	Concept (Monetary)	For Period	Debit	ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods
1255	Currency effect on income tax (expense) benefit and adjustments recognized in the period for current tax of prior periods (1)	Concept (Monetary)	For Period	Debit	opra:CurrencyEffectOnIncomeTaxExpenseBenefitAndAdjustmentsRecognizedInThePeriodForCurrentTaxOfPriorPeriods
1256	Deferred taxes	Concept (Monetary)	For Period	Debit	ifrs-full:DeferredTaxExpenseIncome
1257	Income tax (expense) benefit	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1258	106 - Disclosure - Note 24 - Income Tax (Expense) Benefit - Reconciliation of Tax (Expense) Benefit (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit-reconciliation-of-tax-expense-benefit-details
1259	Statement Table [Table]	Table	*	*	opra:StatementTable
1260	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1261	Entity [Domain]	Member			dei:EntityDomain
1262	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1263	Net income (loss) before income taxes	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossBeforeTax
1264	Tax (expense) benefit at applicable tax rate	Concept (Monetary)	For Period	Debit	ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
1265	Effect of different tax rates applied by subsidiaries	Concept (Monetary)	For Period	Debit	opra:TaxEffectOfDifferentTaxRatesAppliedBySubsidiaries
1266	Tax effect of translation differences exempted for tax	Concept (Monetary)	For Period	Debit	opra:TaxEffectOfTranslationDifferencesExemptedForTax
1267	Tax effect of financial items exempted from tax	Concept (Monetary)	For Period	Debit	opra:TaxEffectOfFinancialItemsExemptedFromTax
1268	Tax effects of losses in associates and joint ventures which are non-deductible	Concept (Monetary)	For Period	Credit	opra:TaxEffectsOfLossesInAssociatesAndJointVenturesWhichAreNondeductible
1269	Net other permanent differences (not) tax deductible	Concept (Monetary)	For Period	Debit	opra:TaxEffectOfExpenseDeductibleNotDeductibleInDeterminingTaxableProfitTaxLoss
1270	Change to previously recognized deferred tax assets	Concept (Monetary)	For Period	Debit	opra:TaxEffectOfTaxChangeToPreviouslyRecognizedDeferredTaxAssets
1271	Currency effect on income tax (expense) benefit and adjustments recognized in the period for current tax of prior periods (1)	Concept (Monetary)	For Period	Debit	opra:CurrencyEffectOnIncomeTaxExpenseBenefitAndAdjustmentsRecognizedInThePeriodForCurrentTaxOfPriorPeriods
1272	Change in unrecognized deferred tax assets	Concept (Monetary)	For Period	Debit	opra:TaxEffectOfChangeInUnrecognizedDeferredTaxAssets
1273	Change in tax rate	Concept (Monetary)	For Period	Debit	ifrs-full:TaxEffectFromChangeInTaxRate
1274	Income tax (expense) benefit for the year	Concept (Monetary)	For Period	Debit	ifrs-full:IncomeTaxExpenseContinuingOperations
1275	Effective tax rate	Concept (Percent)	For Period		ifrs-full:AverageEffectiveTaxRate
1276	107 - Disclosure - Note 24 - Income Tax (Expense) Benefit - Deferred Tax Assets and Liabilities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit-deferred-tax-assets-and-liabilities-details
1277	Statement Table [Table]	Table	*	*	opra:StatementTable
1278	Temporary difference, unused tax losses and unused tax credits [axis]	Axis			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
1279	Temporary difference, unused tax losses and unused tax credits [member]	Member			ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
1280	Temporary difference, furniture, fixtures and equipment, and intangible assets [member]	Member			opra:TemporaryDifferenceFurnitureFixturesAndEquipmentAndIntangibleAssetsMember
1281	Other temporary differences [member]	Member			ifrs-full:OtherTemporaryDifferencesMember
1282	Temporary difference, trade receivables [member]	Member			opra:TemporaryDifferenceTradeReceivablesMember
1283	Temporary difference, intercompany interest costs subject to limitations [member]	Member			opra:TemporaryDifferenceIntercompanyInterestCostsSubjectToLimitationsMember
1284	Temporary difference, withholding tax expected to be credited [member]	Member			opra:TemporaryDifferenceWithholdingTaxExpectedToBeCreditedMember
1285	Allowance for credit losses [member]	Member			ifrs-full:AllowanceForCreditLossesMember
1286	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1287	Entity [Domain]	Member			dei:EntityDomain
1288	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1289	Net deferred tax liability (asset) recognized	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
1290	108 - Disclosure - Note 24 - Income Tax (Expense) Benefit - Changes in Deferred Taxes (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-24-income-tax-expense-benefit-changes-in-deferred-taxes-details
1291	Statement Table [Table]	Table	*	*	opra:StatementTable
1292	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1293	Entity [Domain]	Member			dei:EntityDomain
1294	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1295	Net deferred tax liability (asset) as of January 1	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
1296	Expense (benefit) in Statement of Operations	Concept (Monetary)	For Period		ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
1297	Net deferred tax liability (asset)	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
1298	Deferred tax assets	Concept (Monetary)	As Of	Debit	ifrs-full:NetDeferredTaxAssets
1299	Deferred tax liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NetDeferredTaxLiabilities
1300	Net deferred tax liability	Concept (Monetary)	As Of	Credit	ifrs-full:DeferredTaxLiabilityAsset
1301	109 - Disclosure - Note 25 - Share-based Payments (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-25-sharebased-payments-details-textual
1302	Statement Table [Table]	Table	*	*	opra:StatementTable
1303	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1304	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1305	RSU [member]	Member			opra:RSUMember
1306	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1307	Entity [Domain]	Member			dei:EntityDomain
1308	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1309	Percentage of equity available for grants	Concept (Percent)	For Period		opra:PercentageOfEquityAvailableForGrants
1310	Number of shares in ultimate issure entity	Concept (Shares)	For Period		opra:NumberOfSharesInUltimateIssureEntity
1311	Number of shares set up with parent company for share-based payments arrangement	Concept (Shares)	For Period		opra:NumberOfSharesSetUpWithParentCompanyForASharebasedPaymentsArrangement
1312	Conversion ratio from the count of RSUs granted to ultimate shares to be delivered	Concept (Pure)	For Period		opra:ConversionRatioFromTheCountOfRSUsGrantedToUltimateSharesToBeDelivered
1313	Number of shares represented by ADS	Concept (Shares)	As Of		opra:NumberOfSharesRepresentsByADS
1314	Adjustment factor for reported grants in a share-based payments arrangment	Concept (Pure)	As Of		opra:AdjustmentFactorForReportedGrantsInASharebasedPaymentsArrangment
1315	Number of other equity instruments granted in share-based payment arrangement	Concept (Decimal)	For Period		ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1316	Share-based payments arrangement, vesting schedule, in year one	Concept (Percent)	For Period		opra:SharebasedPaymentsArrangementVestingScheduleInYearOne
1317	Share-based payments arrangement, vesting schedule, in year two	Concept (Percent)	For Period		opra:SharebasedPaymentsArrangementVestingScheduleInYearTwo
1318	Share-based payments arrangement, vesting schedule, in yearthree	Concept (Percent)	For Period		opra:SharebasedPaymentsArrangementVestingScheduleInYearthree
1319	Share-based payments arrangement, vesting schedule, in year four	Concept (Percent)	For Period		opra:SharebasedPaymentsArrangementVestingScheduleInYearFour
1320	Weighted average exercise price of other equity instruments granted in share-based payment arrangement	Concept (Monetary)	For Period		ifrs-full:WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement
1321	Weighted average fair value at measurement date, other equity instruments granted	Concept (Monetary)	As Of	Credit	ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1322	Social security contributions	Concept (Monetary)	For Period	Debit	ifrs-full:SocialSecurityContributions
1323	Weighted average remaining contractual life of outstanding other equity instruments	Concept (Decimal)	As Of		opra:WeightedAverageRemainingContractualLifeOfOutstandingOtherEquityInstruments
1324	110 - Disclosure - Note 25 - Share-based Payments - Expenses from Share-based Payments Transactions (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-25-sharebased-payments-expenses-from-sharebased-payments-transactions-details
1325	Statement Table [Table]	Table	*	*	opra:StatementTable
1326	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1327	Entity [Domain]	Member			dei:EntityDomain
1328	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1329	Expense arising from equity-settled share-based payment transactions (1)	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1330	Expense arising from cash-settled share-based payment transactions	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1331	Total expense from share-based payment transactions	Concept (Monetary)	For Period	Debit	ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
1332	111 - Disclosure - Note 25 - Share-based Payments - RSUs Activities (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-25-sharebased-payments-rsus-activities-details
1333	Statement Table [Table]	Table	*	*	opra:StatementTable
1334	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1335	Entity [Domain]	Member			dei:EntityDomain
1336	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1337	Outstanding at period start	Concept (Decimal)	As Of		ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1338	Granted during the period	Concept (Decimal)	For Period		ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1339	Forfeited during the period	Concept (Decimal)	For Period		ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1340	Exercised during the period	Concept (Decimal)	For Period		ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1341	Expired during the period	Concept (Decimal)	For Period		ifrs-full:NumberOfOtherEquityInstrumentsExpiredInSharebasedPaymentArrangement
1342	Outstanding at period end	Concept (Decimal)	As Of		ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1343	112 - Disclosure - Note 25 - Share-based Payments -Fair Value Measurement (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-25-sharebased-payments-fair-value-measurement-details
1344	Statement Table [Table]	Table	*	*	opra:StatementTable
1345	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1346	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1347	RSU [member]	Member			opra:RSUMember
1348	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1349	Entity [Domain]	Member			dei:EntityDomain
1350	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1351	Current equity unit price valuation ($)	Concept (Monetary)	For Period		ifrs-full:WeightedAverageSharePrice
1352	Expected Volatility (%) (1), (2)	Concept (Percent)	For Period		opra:ExpectedVolatilityOtherEquityInstrumentsGranted
1353	Risk free interest rate (%) (1)	Concept (Percent)	For Period		opra:RiskFreeInterestRateOtherEquityInstrumentsGranted
1354	Dividend Yield (%)	Concept (Percent)	For Period		opra:ExpectedDividendAsPercentageOtherEquityInstrumentsGranted
1355	Duration of initial simulation period (years to longstop date) (Year)	Concept (xbrli:durationItemType)	For Period		opra:DurationOfInitialSimulationPeriodOtherEquityInstrumentsGranted
1356	Duration of second simulation period with postponed exercise (years) (Year)	Concept (xbrli:durationItemType)	For Period		opra:DurationOfSecondSimulationPeriodWithPostponedExerciseOtherEquityInstrumentsGranted
1357	Fair value at the measurement date ($)	Concept (Monetary)	As Of	Credit	ifrs-full:WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
1358	113 - Disclosure - Note 26 - Shareholders and Share Capital (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-26-shareholders-and-share-capital-details-textual
1359	Statement Table [Table]	Table	*	*	opra:StatementTable
1360	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
1361	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
1362	ADS [member]	Member			opra:ADSMember
1363	Ordinary shares [member]	Member			ifrs-full:OrdinarySharesMember
1364	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1365	Entity [Domain]	Member			dei:EntityDomain
1366	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1367	Shares repurchased during period, shares	Concept (Shares)	For Period		opra:SharesRepurchasedDuringPeriodShares
1368	Shares repurchased during period, value	Concept (Monetary)	For Period	Credit	opra:SharesRepurchasedDuringPeriodValue
1369	Dividends recognised as distributions to owners	Concept (Monetary)	For Period	Debit	ifrs-full:DividendsPaid
1370	Number of shares outstanding at end of period	Concept (Shares)	As Of		ifrs-full:NumberOfSharesOutstanding
1371	Par value per share	Concept (Share)	As Of		ifrs-full:ParValuePerShare
1372	Number of shares authorised	Concept (Shares)	As Of		ifrs-full:NumberOfSharesAuthorised
1373	Share repurchase program, accumulated shares repurchased	Concept (Shares)	As Of		opra:ShareRepurchaseProgramAccumulatedSharesRepurchased
1374	114 - Disclosure - Note 26 - Shareholders and Share Capital - Shareholders' Ownership Interest (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-26-shareholders-and-share-capital-shareholders-ownership-interest-details
1375	Statement Table [Table]	Table	*	*	opra:StatementTable
1376	Counterparties [axis]	Axis			ifrs-full:CounterpartiesAxis
1377	Counterparties [member]	Member			ifrs-full:CounterpartiesMember
1378	Kunlun Tech Limited [member]	Member			opra:KunlunTechLimitedMember
1379	Keeneyes Future Holding Inc. [member]	Member			opra:KeeneyesFutureHoldingIncMember
1380	Future Holding L.P. [member]	Member			opra:FutureHoldingLpMember
1381	Qifei International Development Co, Ltd [member]	Member			opra:QifeiInternationalDevelopmentCoLtdMember
1382	Golden Brick Capital Private Equity Fund I L.P. [member]	Member			opra:GoldenBrickCapitalPrivateEquityFundILpMember
1383	Tospring Technology Ltd. [member]	Member			opra:TospringTechnologyLtdMember
1384	The Bank of New York Mellon [member]	Member			opra:TheBankOfNewYorkMellonMember
1385	IDG China Capital Fund III L.P. [member]	Member			opra:IdgChinaCapitalFundIiiLpMember
1386	IDG China Capital III Investors L.P. [member]	Member			opra:IdgChinaCapitalIiiInvestorsLpMember
1387	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1388	Entity [Domain]	Member			dei:EntityDomain
1389	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1390	Shareholders' ownership interest	Concept (Percent)	For Period		opra:ProportionOfOwnershipInterestHeldByACounterParty
1391	115 - Disclosure - Note 27 - Group Entities (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-27-group-entities-details-textual
1392	Statement Table [Table]	Table	*	*	opra:StatementTable
1393	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1394	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
1395	Opera Software Iceland [member]	Member			opra:OperaSoftwareIcelandMember
1396	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1397	Entity [Domain]	Member			dei:EntityDomain
1398	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1399	Proportion of voting rights held in subsidiary	Concept (Percent)	For Period		ifrs-full:ProportionOfVotingPowerHeldInSubsidiary
1400	116 - Disclosure - Note 27 - Group Entities - Subsidiaries (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-27-group-entities-subsidiaries-details
1401	Statement Table [Table]	Table	*	*	opra:StatementTable
1402	Subsidiaries [axis]	Axis			ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1403	Entity's total for subsidiaries [member]	Member			ifrs-full:EntitysTotalForSubsidiariesMember
1404	Kunhoo Software [member]	Member			opra:KunhooSoftwareMember
1405	Kunhoo Software Limited [member]	Member			opra:KunhooSoftwareLimitedMember
1406	Kunhoo Software S.a.r.l [member]	Member			opra:KunhooSoftwareSarlMember
1407	Kunhoo Software AS [member]	Member			opra:KunhooSoftwareASMember
1408	Opera Software AS [member]	Member			opra:OperaSoftwareASMember
1409	Opera Software Holdings [member]	Member			opra:OperaSoftwareHoldingsMember
1410	Opera Software Americas [member]	Member			opra:OperaSoftwareAmericasMember
1411	Opera Software Ireland Limited [member]	Member			opra:OperaSoftwareIrelandLimitedMember
1412	Hern Labs AB [member]	Member			opra:HernLabsABMember
1413	Opera Software International AS [member]	Member			opra:OperaSoftwareInternationalASMember
1414	Opera Software Netherlands BV [member]	Member			opra:OperaSoftwareNetherlandsBVMember
1415	Opera Software India Private Limited [Member]	Member			opra:OperaSoftwareIndiaPrivateLimitedMember
1416	Opera Software Poland [member]	Member			opra:OperaSoftwarePolandMember
1417	Opera Software Technology (Beijing) [member]	Member			opra:OperaSoftwareTechnologyBeijingMember
1418	Beijing Yuega Software Tech. Srvc. Co. Ltd [member]	Member			opra:BeijingYuegaSoftwareTechSrvcCoLtdMember
1419	Opesa South Afri Ca (Pty) Limited [member]	Member			opra:OpesaSouthAfriCaPtyLimitedMember
1420	O-Play Digital Services [member]	Member			opra:OPlayDigitalServicesMember
1421	O-Play Kenya Limited [member]	Member			opra:OPlayKenyaLimitedMember
1422	Phoneservice Technologies [member]	Member			opra:PhoneserviceTechnologiesMember
1423	O-Play Zambia Limited [member]	Member			opra:OplayZambiaLimitedMember
1424	TenSpot Pesa Limited [member]	Member			opra:TenSpotPesaLimitedMember
1425	LLC Microcredit Company O-Pay [member]	Member			opra:LLCMicrocreditCompnayOpayMember
1426	Neofin Mailane [member]	Member			opra:NeofinMailaneMember
1427	Opay Finance India [member]	Member			opra:OpayFinanceIndiaMember
1428	Blue Ridge Micro Finance Bank [member]	Member			opra:BlueRidgeMicroFinanceBankMember
1429	Oplay Digital Services SA [member]	Member			opra:OplayDigitalServicesSAMember
1430	PT Opay Finance Services [member]	Member			opra:PTOpayFinanceServicesMember
1431	PT lnpesa Digital Teknologi [member]	Member			opra:PtLnpesaDigitalTeknologiMember
1432	TenSpot Kenya Limited [member]	Member			opra:TenSpotKenyaLimitedMember
1433	PC Financial Services Pvt [member]	Member			opra:PCFiancialServicesPvtMember
1434	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1435	Entity [Domain]	Member			dei:EntityDomain
1436	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1437	Subsidiaries	Concept (Percent)	For Period		ifrs-full:ProportionOfVotingPowerHeldInSubsidiary
1438	117 - Disclosure - Note 28 - Business Combinations (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-28-business-combinations-details-textual
1439	Statement Table [Table]	Table	*	*	opra:StatementTable
1440	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
1441	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
1442	TenSpot Pesa Limited [member]	Member			opra:TenSpotPesaLimitedMember
1443	Beijing Kunlun Tech [member]	Member			opra:BeijingKunlunTechMember
1444	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1445	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1446	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
1447	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1448	Entity [Domain]	Member			dei:EntityDomain
1449	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1450	Percentage of voting equity interests acquired	Concept (Percent)	As Of		ifrs-full:PercentageOfVotingEquityInterestsAcquired
1451	Cash transferred	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
1452	Proportion of ownership interest in associate	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
1453	Financial assets recognised as of acquisition date	Concept (Monetary)	As Of	Debit	ifrs-full:FinancialAssetsRecognisedAsOfAcquisitionDate
1454	Cash and cash equivalents recognised as of acquisition date	Concept (Monetary)	As Of	Debit	ifrs-full:CashAndCashEquivalentsRecognisedAsOfAcquisitionDate
1455	Difference between consideration transferred and net assets acquired, recognized as reduction of retained earnings	Concept (Monetary)	For Period	Debit	opra:DifferenceBetweenConsiderationTransferredAndNetAssetsAcquiredRecognizedAsReductionOfRetainedEarnings
1456	118 - Disclosure - Note 29 - Investments in Associates and Joint Ventures (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-29-investments-in-associates-and-joint-ventures-details-textual
1457	Statement Table [Table]	Table	*	*	opra:StatementTable
1458	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1459	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1460	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
1461	StarMaker Inc. [member]	Member			opra:StarmakerIncMember
1462	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
1463	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
1464	Acquisition of OKash [member]	Member			opra:AcquisitionOfOKashMember
1465	TenSpot Pesa Limited [member]	Member			opra:TenSpotPesaLimitedMember
1466	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1467	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1468	nHorizon [member]	Member			opra:nHorizonMember
1469	Powerbets Holdings Limited [member]	Member			opra:PowerbetsHoldingsLimitedMember
1470	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1471	Entity [Domain]	Member			dei:EntityDomain
1472	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1473	Proportion of ownership interest in associate	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
1474	Number of agents recruited	Concept (Integer)	For Period		opra:NumberOfAgentsRecruited
1475	Average daily transaction value	Concept (Monetary)	For Period		opra:AverageDailyTransactionValue
1476	Average daily transaction value, peak days	Concept (Monetary)	For Period		opra:AverageDailyTransactionValuePeakDays
1477	Cash transferred	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
1478	Percentage of voting equity interests acquired	Concept (Percent)	As Of		ifrs-full:PercentageOfVotingEquityInterestsAcquired
1479	Gain recognised on business combination	Concept (Monetary)	For Period	Credit	opra:GainRecognisedOnBusinessCombination
1480	Total investments in subsidiaries, joint ventures and associates	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1481	Proportion of voting rights held in associate, option to increase	Concept (Percent)	For Period		opra:ProportionOfVotingRightsHeldInAssociateOptionToIncrease
1482	119 - Disclosure - Note 29 - Investments in Associates and Joint Ventures - Information Regarding Investments (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-29-investments-in-associates-and-joint-ventures-information-regarding-investments-details
1483	Statement Table [Table]	Table	*	*	opra:StatementTable
1484	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1485	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1486	nHorizon [member]	Member			opra:nHorizonMember
1487	Powerbets Holdings Limited [member]	Member			opra:PowerbetsHoldingsLimitedMember
1488	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1489	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1490	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
1491	StarMaker Inc. [member]	Member			opra:StarmakerIncMember
1492	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1493	Entity [Domain]	Member			dei:EntityDomain
1494	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1495	Revenue	Concept (Monetary)	For Period	Credit	ifrs-full:Revenue
1496	Operating profit (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossFromOperatingActivities
1497	Net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLoss
1498	Group�s share of net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1499	Assets	Concept (Monetary)	As Of	Debit	ifrs-full:Assets
1500	Short-term liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
1501	Equity	Concept (Monetary)	As Of	Credit	ifrs-full:Equity
1502	The Group�s interest	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
1503	Group�s share of net income (loss), before adjustment	Concept (Monetary)	For Period	Credit	opra:ProfitLossAttributableToOwnersOfParentBeforeAdjustment
1504	Adjustments related to amortization of intangible assets	Concept (Monetary)	For Period	Debit	opra:IncreaseDecreaseInIntangibleAssetsDueToAmortization
1505	Group�s share of net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1506	Other comprehensive income that may be reclassified to net income	Concept (Monetary)	For Period	Credit	ifrs-full:OtherComprehensiveIncome
1507	Total comprehensive income	Concept (Monetary)	For Period	Credit	ifrs-full:ComprehensiveIncome
1508	Current assets	Concept (Monetary)	As Of	Debit	ifrs-full:CurrentAssets
1509	Non-current assets	Concept (Monetary)	As Of	Debit	ifrs-full:NoncurrentAssets
1510	Current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:CurrentLiabilities
1511	Non-current liabilities	Concept (Monetary)	As Of	Credit	ifrs-full:NoncurrentLiabilities
1512	120 - Disclosure - Note 29 - Investments in Associates and Joint Ventures - Carrying Amounts (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-29-investments-in-associates-and-joint-ventures-carrying-amounts-details
1513	Statement Table [Table]	Table	*	*	opra:StatementTable
1514	Joint ventures [axis]	Axis			ifrs-full:JointVenturesAxis
1515	Entity's total for joint ventures [member]	Member			ifrs-full:EntitysTotalForJointVenturesMember
1516	nHorizon [member]	Member			opra:nHorizonMember
1517	Powerbets Holdings Limited [member]	Member			opra:PowerbetsHoldingsLimitedMember
1518	Associates [axis]	Axis			ifrs-full:SignificantInvestmentsInAssociatesAxis
1519	Entity's total for associates [member]	Member			ifrs-full:EntitysTotalForAssociatesMember
1520	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
1521	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1522	Entity [Domain]	Member			dei:EntityDomain
1523	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1524	Investment	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1525	Investment during the fiscal year	Concept (Monetary)	For Period	Debit	opra:IncreaseInInvestmentInJointVenturesAndAssociates
1526	Loan made to Powerbets Holdings reclassified from other receivables	Concept (Monetary)	For Period	Debit	opra:IncreaseInInvestmentInJointVenturesAndAssociatesFromLoansReclassifiedAsReceivables
1527	FX adjustment	Concept (Monetary)	For Period	Debit	opra:IncreaseDecreaseInInvestmentsInJointVenturesAndAssociatesFromForeignCurrencyAdjustment
1528	Share of net income (loss)	Concept (Monetary)	For Period	Credit	opra:ShareOfNetIncomeLossOfInvestmentsInJointVenturesAndAssociates
1529	Investments in associates and joint ventures	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1530	The Group�s interest	Concept (Percent)	For Period		ifrs-full:ProportionOfOwnershipInterestInAssociate
1531	Group�s share in equity	Concept (Monetary)	As Of	Debit	opra:ProportionOfInvestmentInJointVenturesAndAssociatesValue
1532	Intangible assets	Concept (Monetary)	As Of	Debit	ifrs-full:IntangibleAssetsAndGoodwill
1533	Other equity method adjustments	Concept (Monetary)	For Period	Debit	opra:IncreaseDecreaseInInvestmentsInJointVenturesAndAssociatesDueToOther
1534	Share of other comprehensive income	Concept (Monetary)	For Period	Credit	opra:ShareOfOtherComprehensiveIncomeLossOfInvestmentsInJointVenturesAndAssociates
1535	Equity method adjustments	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentAccountedForUsingEquityMethod
1536	Investment	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1537	121 - Disclosure - Note 30 - Related Parties (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-30-related-parties-details-textual
1538	Statement Table [Table]	Table	*	*	opra:StatementTable
1539	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1540	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1541	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
1542	Joint control over Powerbets [member]	Member			opra:JointControlOverPowerbetsMember
1543	Investment in StarMaker [member]	Member			opra:InvestmentInStarmakerMember
1544	Acquisition of OKash from Opay [member]	Member			opra:AcquisitionOfOKashFromOpayMember
1545	Services provided and received to related parties [member]	Member			opra:ServicesProvidedAndReceivedToRelatedPartiesMember
1546	Prepayments to 360 Mobile Security [member]	Member			opra:PrepaymentsTo360MobileSecurityMember
1547	Business combinations [axis]	Axis			ifrs-full:BusinessCombinationsAxis
1548	Entity's total for business combinations [member]	Member			ifrs-full:EntitysTotalForBusinessCombinationsMember
1549	Acquisition of OKash [member]	Member			opra:AcquisitionOfOKashMember
1550	Range [axis]	Axis			ifrs-full:RangeAxis
1551	Ranges [member]	Member			ifrs-full:RangesMember
1552	Bottom of range [member]	Member			ifrs-full:BottomOfRangeMember
1553	Top of range [member]	Member			ifrs-full:TopOfRangeMember
1554	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1555	Entity [Domain]	Member			dei:EntityDomain
1556	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1557	Maximum borrowing capacity provided to related party	Concept (Monetary)	As Of	Debit	opra:MaximumBorrowingCapacityProvidedToRelatedParty
1558	Line of credit, receivable from related party	Concept (Monetary)	As Of	Debit	opra:LineOfCreditReceivableFromRelatedParty
1559	Loan receivable from related party	Concept (Monetary)	As Of	Debit	opra:LoanReceivableFromRelatedParty
1560	Total investments in subsidiaries, joint ventures and associates	Concept (Monetary)	As Of	Debit	ifrs-full:InvestmentsInSubsidiariesJointVenturesAndAssociates
1561	Proportion of voting rights held in associate	Concept (Percent)	For Period		ifrs-full:ProportionOfVotingPowerHeldInAssociate
1562	Proportion of voting rights held in associate, option to increase	Concept (Percent)	For Period		opra:ProportionOfVotingRightsHeldInAssociateOptionToIncrease
1563	Cash transferred	Concept (Monetary)	As Of	Credit	ifrs-full:CashTransferred
1564	Percent of markup on invoices	Concept (Percent)	As Of		opra:PercentOfMarkupOnInvoices
1565	Receivables due from related parties	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherReceivablesDueFromRelatedParties
1566	122 - Disclosure - Note 30 - Related Parties - Outstanding Balances and Transactions (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-30-related-parties-outstanding-balances-and-transactions-details
1567	Statement Table [Table]	Table	*	*	opra:StatementTable
1568	Categories of related parties [axis]	Axis			ifrs-full:CategoriesOfRelatedPartiesAxis
1569	Entity's total for related parties [member]	Member			ifrs-full:EntitysTotalForRelatedPartiesMember
1570	Accounts receivable from 360 Mobile Security Limited [member]	Member			opra:AccountsReceivableFrom360MobileSecurityLimitedMember
1571	Technology and other revenue from Opay Digital Services Limited [member]	Member			opra:TechnologyAndOtherRevenueFromOpayDigitalServicesLimitedMember
1572	Distribution prepayment from 360 Mobile Security Limited [member]	Member			opra:DistributionPrepaymentFrom360MobileSecurityLimitedMember
1573	Technology, other, and advertising revenue from Powerbets Holdings Limited [member]	Member			opra:TechnologyOtherAndAdvertisingRevenueFromPowerbetsHoldingsLimitedMember
1574	Other payables to Bejing Kunlun Tech [member]	Member			opra:OtherPayablesToBejingKunlunTechMember
1575	Technology, other, and advertising revenue from 360 Mobile Security Limited [member]	Member			opra:TechnologyOtherAndAdvertisingRevenueFrom360MobileSecurityLimitedMember
1576	Revenue share liability to nHorizon Innovation [member]	Member			opra:RevenueShareLiabilityToNhorizonInnovationMember
1577	Advertising revenue from Kunlun Global International [member]	Member			opra:AdvertisingRevenueFromKunlunGlobalInternationalMember
1578	Professional service receivable from nHorizon Innovation [member]	Member			opra:ProfessionalServiceReceivableFromNhorizonInnovationMember
1579	Technology and other revenue from nHorizon Innovation [member]	Member			opra:TechnologyAndOtherRevenueFromNhorizonInnovationMember
1580	Professional service payable to nHorizon Innovation [member]	Member			opra:ProfessionalServicePayableToNhorizonInnovationMember
1581	Investment to Starmaker Interactive [member]	Member			opra:InvestmentToStarmakerInteractiveMember
1582	Loans receivable from Opay Digital Services Limited [member]	Member			opra:LoansReceivableFromOpayDigitalServicesLimitedMember
1583	Marketing and distribution expense to 360 Mobile Security Limited [member]	Member			opra:MarketingAndDistributionExpenseTo360MobileSecurityLimitedMember
1584	Trade receivable from Opay Digital Services Limited [member]	Member			opra:TradeReceivableFromOpayDigitalServicesLimitedMember
1585	Office facilities expense to Beijing Kunlun Tech [member]	Member			opra:OfficeFacilitiesExpenseToBeijingKunlunTechMember
1586	Opay Digital Services Limited [member]	Member			opra:OpayDigitalServicesLimitedMember
1587	Professional services expense to Kunlun AI [member]	Member			opra:ProfessionalServicesExpenseToKunlunAIMember
1588	Loans receivable from Powerbets Holding Limited [member]	Member			opra:LoansReceivableFromPowerbetsHoldingLimitedMember
1589	Cost of revenue to nHorizon Innovation [member]	Member			opra:CostOfRevenueToNhorizonInnovationMember
1590	Trade receivable from Powerbets Holding Limited [member]	Member			opra:TradeReceivableFromPowerbetsHoldingLimitedMember
1591	Professional services to nHorizon [member]	Member			opra:ProfessionalServicesToNhorizonMember
1592	Loan receivable from Starmaker Interactive [member]	Member			opra:LoanReceivableFromStarmakerInteractiveMember
1593	Professional services to Starmaker Interactive [member]	Member			opra:ProfessionalServicesToStarmakerInteractiveMember
1594	Aqcuisition cost to Opay Digital Services Limited [member]	Member			opra:AqcuisitionCostToOpayDigitalServicesLimitedMember
1595	Investment to Opay Digital Services Limited (HK) [member]	Member			opra:InvestmentToOpayDigitalServicesLimitedHkMember
1596	License fee (cost of revenue) to Opay Digital Services Limited (HK) [member]	Member			opra:LicenseFeeCostOfRevenueToOpayDigitalServicesLimitedHkMember
1597	Investment to nHorizon Innovation (Beijing) Software Ltd [member]	Member			opra:InvestmentToNhorizonInnovationBeijingSoftwareLtdMember
1598	Investment to Powerbets Holdings Limited [member]	Member			opra:InvestmentToPowerbetsHoldingsLimitedMember
1599	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1600	Entity [Domain]	Member			dei:EntityDomain
1601	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1602	Related party receivables	Concept (Monetary)	As Of	Debit	ifrs-full:TradeAndOtherReceivablesDueFromRelatedParties
1603	Related party payables	Concept (Monetary)	As Of	Credit	ifrs-full:TradeAndOtherPayablesToRelatedParties
1604	Transactions with related parties	Concept (Monetary)	For Period	Credit	opra:IncomeFromExpensesToRelatedParties
1605	123 - Disclosure - Note 31 - Net Income (Loss) Per Share (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-31-net-income-loss-per-share-details-textual
1606	Statement Table [Table]	Table	*	*	opra:StatementTable
1607	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1608	Entity [Domain]	Member			dei:EntityDomain
1609	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1610	Number of shares outstanding at end of period	Concept (Shares)	As Of		ifrs-full:NumberOfSharesOutstanding
1611	Number of share surrendered	Concept (Shares)	For Period		opra:NumberOfShareSurrendered
1612	Number of ordinary shares per share of ADS	Concept (Shares)	As Of		opra:NumberOfOrdinarySharesPerShareOfAds
1613	124 - Disclosure - Note 31 - Net Income (Loss) Per Share - Income (Loss) Per Share (Details)	Network	*	*	http://www.opera.com/20181231/role/statement-note-31-net-income-loss-per-share-income-loss-per-share-details
1614	Statement Table [Table]	Table	*	*	opra:StatementTable
1615	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
1616	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
1617	ADS [member]	Member			opra:ADSMember
1618	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1619	Entity [Domain]	Member			dei:EntityDomain
1620	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1621	Group�s share of net income (loss)	Concept (Monetary)	For Period	Credit	ifrs-full:ProfitLossAttributableToOwnersOfParent
1622	Issued ordinary shares at beginning of period (in shares)	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
1623	Effect of shares issued (in shares)	Concept (Shares)	For Period		ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
1624	Effect of treasury shares held (in shares)	Concept (Shares)	For Period		opra:IncreaseDecreaseInNumberOfSharesIssuedDueToTreasuryShares
1625	Basic weighted-average number of ordinary shares in the period (in shares)	Concept (Shares)	For Period		ifrs-full:AdjustedWeightedAverageShares
1626	Basic net income (loss) per share, US$ (in dollars per share)	Concept (Share)	For Period		ifrs-full:BasicEarningsLossPerShare
1627	Basic weighted-average number of ordinary shares (in shares)	Concept (Shares)	For Period		opra:DilutedWeightedAverageShares
1628	Effect of employee equity grants (in shares)	Concept (Shares)	For Period		ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1629	Diluted weighted-average number of ordinary shares in the period (in shares)	Concept (Shares)	For Period		opra:AdjustedDilutedWeightedAverageShares
1630	Diluted net income per share, US$ (in dollars per share)	Concept (Share)	For Period		ifrs-full:DilutedEarningsLossPerShare
1631	ADS equivalent of basic weighted-average number of ordinary shares (in shares)	Concept (Shares)	For Period		ifrs-full:WeightedAverageShares
1632	ADS equivalent of diluted weighted-average number of ordinary shares (in shares)	Concept (Shares)	For Period		ifrs-full:AdjustedWeightedAverageShares
1633	125 - Disclosure - Note 32 - Events After the Reporting Period (Details Textual)	Network	*	*	http://www.opera.com/20181231/role/statement-note-32-events-after-the-reporting-period-details-textual
1634	Statement Table [Table]	Table	*	*	opra:StatementTable
1635	Non-adjusting events after reporting period [axis]	Axis			ifrs-full:NonadjustingEventsAfterReportingPeriodAxis
1636	Non-adjusting events after reporting period [member]	Member			ifrs-full:NonadjustingEventsMember
1637	Potential ordinary share transactions [member]	Member			ifrs-full:PotentialOrdinaryShareTransactionsMember
1638	Entering into significant commitments or contingent liabilities [member]	Member			ifrs-full:EnteringIntoSignificantCommitmentsOrContingentLiabilitiesMember
1639	RSUs were exchanged for an equivalent number of ADSs [member]	Member			opra:RsusWereExchangedForAnEquivalentNumberOfAdssMember
1640	Major ordinary share transactions [member]	Member			ifrs-full:MajorOrdinaryShareTransactionsMember
1641	Types of share-based payment arrangements [axis]	Axis			ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1642	Share-based payment arrangements [member]	Member			ifrs-full:SharebasedPaymentArrangementsMember
1643	Amended and restated share incentive plan [member]	Member			opra:AmendedAndRestatedShareIncentivePlanMember
1644	Classes of share capital [axis]	Axis			ifrs-full:ClassesOfShareCapitalAxis
1645	Share capital [member]	Member			ifrs-full:ClassesOfShareCapitalMember
1646	ADS [member]	Member			opra:ADSMember
1647	Ordinary shares of Opera Limited [member]	Member			opra:OrdinarySharesOfOperaLimitedMember
1648	Types of contracts [axis]	Axis			ifrs-full:TypesOfContractsAxis
1649	Types of contracts [member]	Member			ifrs-full:TypesOfContractsMember
1650	Lease agreement for Oslo headquarters [Member]	Member			opra:LeaseAgreementForOsloHeadquartersMember
1651	Legal Entity [Axis]	Axis			dei:LegalEntityAxis
1652	Entity [Domain]	Member			dei:EntityDomain
1653	Kunlun Tech Limited [member]	Member			opra:KunlunTechLimitedMember
1654	Counterparty Name [Axis]	Axis			srt:CounterpartyNameAxis
1655	Counterparty Name [Domain]	Member			srt:RepurchaseAgreementCounterpartyNameDomain
1656	Golden Brick [member]	Member			opra:GoldenBrickMember
1657	Statement Line Items [Line Items]	LineItems			opra:StatementLineItems
1658	Number of shares reserved for issue under options and contracts for sale of shares	Concept (Shares)	As Of		ifrs-full:SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
1659	Minimum lease payments payable under non-cancellable operating lease	Concept (Monetary)	As Of	Credit	ifrs-full:MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
1660	Shares repurchased during period, shares	Concept (Shares)	For Period		opra:SharesRepurchasedDuringPeriodShares
1661	Shares repurchased during period, weighted average price per share, net of commission	Concept (Share)	For Period		opra:SharesRepurchasedDuringPeriodWeightedAveragePricePerShareNetOfCommission
1662	Shares repurchased during period, weighted average price per share	Concept (Share)	For Period		opra:SharesRepurchasedDuringPeriodWeightedAveragePricePerShare
1663	Number of RSUs exchanged for equivalent number of ADSs	Concept (Shares)	For Period		opra:NumberOfRsusExchangedForEquivalentNumberOfAdss
1664	Shares transferred, shares	Concept (Shares)	For Period		opra:SharesTransferredShares
1665	Shares transferred, value	Concept (Monetary)	For Period	Credit	opra:SharesTransferredValue