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Note 11 - Accumulated Other Comprehensive Income (Details) - Components of AOCI (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Gains/(losses)on cash flow hedges |  |  |  |
Commodity derivative contracts | $ 282 | $ (594) | $ 1 | $ (1,551)
| 108 | 228 | 0 | 596
| $ 108 |  | $ 1 |

X
- Definition Tax effect on amount of gains on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income. + References No definition available. + Details
Name: | cvti_CashFlowHedgeGainReclassifiedToEarningsTax
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cvti_GainsLossesOnCashFlowHedgesAbstract
Namespace Prefix: | cvti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of gains on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income, net of the related tax impact. + References No definition available. + Details
Name: | cvti_GainsLossesonCashFlowHedgesNetofTax
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of net gains or losses on price risk cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income. + References No definition available. + Details
Name: | us-gaap_PriceRiskCashFlowHedgeGainOrLossReclassifiedToEarningsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration