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Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) | Mar. 31, 2015 | Dec. 31, 2014
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Revenue Equipment Installment Notes [Member] |  |
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on notes payable, current | 3.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RevenueEquipmentInstallmentNotesMember | 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RevenueEquipmentInstallmentNotesMember
Interest rate on notes payable, long-term | 3.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RevenueEquipmentInstallmentNotesMember | 3.80%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RevenueEquipmentInstallmentNotesMember
Real Estate Note [Member] |  |
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on notes payable, current | 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RealEstateNoteMember | 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RealEstateNoteMember
Interest rate on notes payable, long-term | 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RealEstateNoteMember | 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_RealEstateNoteMember
Other Note Payable [Member] |  |
Note 7 - Debt (Details) - Current and Long-term Debt (Parentheticals) [Line Items] |  |
Interest rate on notes payable, current | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_OtherNotePayableMember | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_OtherNotePayableMember
Interest rate on notes payable, long-term | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_OtherNotePayableMember | 3.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cvti_OtherNotePayableMember

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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