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Note 3 - Fair Value of Financial Instruments (Details Textual) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Derivative, Collateral Right to Reclaim Cash, Net	$ 0	$ 5,000,000

X

- Definition

Amount of right to receive cash collateral under master netting arrangements that has been offset against derivative liabilities.

+ References

No definition available.

+ Details

Name:	cvti_DerivativeCollateralRightToReclaimCashNet
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant