Financing Arrangements - Components of Borrowing Base Formula to Determine Credit Availability (Detail)	3 Months Ended
Mar. 31, 2014
Debt Disclosure [Abstract]
Percentage of eligible accounts receivable	85.00%
The lesser of:
Percentage of lower of cost or market of eligible inventory	65.00%
Percentage of appraised net orderly liquidation value of eligible inventory	85.00%
Percentage of commercial letters of credit	65.00%

Borrowing base formula, percentage of commercial letters of credit issued for purchase of inventory.

No definition available.

Name:	cobr_BorrowingBaseFormulaPercentageOfCommercialLettersOfCreditIssuedForPurchaseOfInventory
Namespace Prefix:	cobr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration