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Note 17 - Quarterly Results of Operations (Unaudited) (Details) (USD $) | 12 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Aug. 26, 2014 | Sep. 30, 2014
Note 17 - Quarterly Results of Operations (Unaudited) (Details) [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment | $ 33,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | $ (81,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment | $ (198,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment |  |  |
Terminal Property [Member] |  |  |  |  |  |
Note 17 - Quarterly Results of Operations (Unaudited) (Details) [Line Items] |  |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment |  |  |  | 2,400,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cvti_TerminalPropertyMember |  |
Cargo Claim [Member] |  |  |  |  |  |
Note 17 - Quarterly Results of Operations (Unaudited) (Details) [Line Items] |  |  |  |  |  |
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve |  |  |  |  | $ 7,500,000 us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember | $ 8,100,000 us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in the reserve account established to account for expected but unspecified losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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