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Note 10 - Related Party Transactions and Parent Company Equity (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Selling, General and Administrative Expenses [Member]
Allocation of Overhead and Other Expenses from Parent	$ 1,900	$ 2,400	$ 5,800	$ 4,500
Allocation of Overhead and Other Expenses from Parent			$ 5,800		$ 12,671

X

- Definition

Represents information about the allocation of overhead and other expenses from the Parent to the Company.

+ References

No definition available.

+ Details

Name:	coi_AllocationOfOverheadAndOtherExpensesFromParent
Namespace Prefix:	coi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: