| Standard label: | Major Customers, Policy [Policy Text Block] |
| Name: | us-gaap:MajorCustomersPolicyPolicyTextBlock |
| Documentation: | Disclosure of accounting policy for major customers. Major customers are those that the loss of such customers would have a material adverse effect on the entity. |
| Object type: | cm:Level2TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:MajorCustomersPolicyPolicyTextBlock |
| Label | Role | Language |
| Major Customers, Policy [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 275 10 50 16 | http://fasb.org/us-gaap/role/ref/legacyRef | 275 |
| FASB Accounting Standards Codification 275 10 50 18 | http://fasb.org/us-gaap/role/ref/legacyRef | 275 |
| FASB Accounting Standards Codification 275 10 50 20 | http://fasb.org/us-gaap/role/ref/legacyRef | 275 |
| FASB Accounting Standards Codification 280 10 50 42 | http://fasb.org/us-gaap/role/ref/legacyRef | 280 |