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Note 3 - Fair Value of Financial Instruments (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Disclosures [Abstract] |  |
Derivative, Collateral, Right to Reclaim Cash, Net | $ 5,000,000 cvti_DerivativeCollateralRightToReclaimCashNet | $ 0.0 cvti_DerivativeCollateralRightToReclaimCashNet

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

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- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration