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Note 7 - Debt (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 29, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2008 | May 31, 2011
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  |  |  | $ 85,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |
Line Of Credit Facility, Maximum Increase In Borrowing Capacity (in Dollars) |  |  |  | 50,000,000 cvti_LineOfCreditFacilityMaximumIncreaseInBorrowingCapacity |
Line of Credit Facility, Availability Block Removed (in Dollars) | 15,000,000 cvti_LineOfCreditFacilityAvailabilityBlockRemoved |  |  |  |
Line Of Credit Facility, Revolver Commitment Amount (in Dollars) |  | 25,000,000 cvti_LineOfCreditFacilityRevolverCommitmentAmount |  |  |
Line Of Credit Facility, Availability As Percentage Of Revolver Commitment |  | 35.00%cvti_LineOfCreditFacilityAvailabilityAsPercentageOfRevolverCommitment |  |  |
Maximum Stock Repurchase Aggregate Amount Allowed Pursuant To Credit Facility Agreement (in Dollars) | 5,000,000 cvti_MaximumStockRepurchaseAggregateAmountAllowedPursuantToCreditFacilityAgreement |  |  |  |
Debt Instrument, Fee Amount (in Dollars) |  |  | 300,000 us-gaap_DebtInstrumentFeeAmount |  |
Percent Of Eligible Accounts Receivable |  | 85.00%cvti_PercentOfEligibleAccountsReceivable |  |  |
Percent of Appraised Net Orderly Liquidation Value of Eligible Revenue Equipment |  | 85.00%cvti_PercentOfAppraisedNetOrderlyLiquidationValueOfEligibleRevenueEquipment |  |  |
Percent of Net Book Value of Eligible Revenue Equipment |  | 95.00%cvti_PercentOfNetBookValueOfEligibleRevenueEquipment |  |  |
Percent Of Appraised Fair Market Value Of Eligible Real Estate |  | 65.00%cvti_PercentOfAppraisedFairMarketValueOfEligibleRealEstate |  |  |
Long-term Line of Credit (in Dollars) |  | 0 us-gaap_LineOfCredit |  |  |
Letters of Credit Outstanding, Amount (in Dollars) |  | 34,300,000 us-gaap_LettersOfCreditOutstandingAmount | 39,000,000 us-gaap_LettersOfCreditOutstandingAmount |  |
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) |  | 60,700,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity |  |  |
Debt, Secured with a Cross Default Feature (in Dollars) |  | 174,600,000 cvti_DebtSecuredWithACrossDefaultFeature |  |  |
Commodity Contract Asset, Current (in Dollars) |  | 12,800,000 us-gaap_CommodityContractAssetCurrent |  |  |
Transport Enterprise Leasing, LLC [Member] | Eighth Amendment [Member] | Maximum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_DebtInstrumentAxis = cvti_EighthAmendmentMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  |
Transport Enterprise Leasing, LLC [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember
Eighth Amendment [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) | 95,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = cvti_EighthAmendmentMember |  |  |  |
Base Rate Loans [Member] | Federal Funds Rate [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cvti_BaseRateLoansMember / us-gaap_VariableRateAxis = cvti_FederalFundsRateMember |  |  |
Base Rate Loans [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cvti_BaseRateLoansMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Base Rate Loans [Member] | Applicable Margin [Member] | Maximum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cvti_BaseRateLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = cvti_ApplicableMarginMember |  |  |
Base Rate Loans [Member] | Applicable Margin [Member] | Minimum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cvti_BaseRateLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = cvti_ApplicableMarginMember |  |  |
LIBOR [Member] | Applicable Margin [Member] | Maximum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cvti_LIBORMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = cvti_ApplicableMarginMember |  |  |
LIBOR [Member] | Applicable Margin [Member] | Minimum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = cvti_LIBORMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = cvti_ApplicableMarginMember |  |  |
Letter of Credit [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  |  |  | 85,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |
Swing Line Sub Facility [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) |  |  |  | 10,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = cvti_SwingLineSubFacilityMember |
Percent of Aggregate Commitments Under Credit Facility |  |  |  | 10.00%cvti_PercentOfAggregateCommitmentsUnderCreditFacility / us-gaap_CreditFacilityAxis = cvti_SwingLineSubFacilityMember |
When Availability Is Less Than $50 Million [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = cvti_WhenAvailabilityIsLessThan50MillionMember |  |  |  |
When Availability Is At Least $50 Million [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = cvti_WhenAvailabilityIsAtLeast50MillionMember |  |  |  |
Testing of Fixed Charge Coverage Ratio Covenant [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 12.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = cvti_TestingOfFixedChargeCoverageRatioCovenantMember |  |  |  |
Line Of Credit Facility, Revolver Commitment Amount (in Dollars) | 11,900,000 cvti_LineOfCreditFacilityRevolverCommitmentAmount / us-gaap_CreditFacilityAxis = cvti_TestingOfFixedChargeCoverageRatioCovenantMember |  |  |  |
Cash Dominion Applies [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line Of Credit Facility, Revolver Commitment Amount (in Dollars) | $ 14,300,000 cvti_LineOfCreditFacilityRevolverCommitmentAmount / us-gaap_CreditFacilityAxis = cvti_CashDominionAppliesMember |  |  |  |
Line Of Credit Facility, Availability As Percentage Of Revolver Commitment | 15.00%cvti_LineOfCreditFacilityAvailabilityAsPercentageOfRevolverCommitment / us-gaap_CreditFacilityAxis = cvti_CashDominionAppliesMember |  |  |  |
Maximum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Minimum [Member] |  |  |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |  | 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |

X
- Definition Debt, Secured with a Cross Default Feature + References No definition available. + Details
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Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The availability of line of credit facility as percentage of the revolver commitment. + References No definition available. + Details
Name: | cvti_LineOfCreditFacilityAvailabilityAsPercentageOfRevolverCommitment
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The line of credit facility's availability block which was eliminated when the 8th amendment was entered. + References No definition available. + Details
Name: | cvti_LineOfCreditFacilityAvailabilityBlockRemoved
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of credit facility's maximum increase in borrowing capacity as long as no event of default exists. + References No definition available. + Details
Name: | cvti_LineOfCreditFacilityMaximumIncreaseInBorrowingCapacity
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The revolver commitment amount + References No definition available. + Details
Name: | cvti_LineOfCreditFacilityRevolverCommitmentAmount
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The maximum stock repurchase aggregate amount allowed pursuant to the credit facility agreement. + References No definition available. + Details
Name: | cvti_MaximumStockRepurchaseAggregateAmountAllowedPursuantToCreditFacilityAgreement
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | cvti_Note7DebtDetailsLineItems
Namespace Prefix: | cvti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent of the lenders' aggregate commitments under the credit facility. + References No definition available. + Details
Name: | cvti_PercentOfAggregateCommitmentsUnderCreditFacility
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percent of appraised fair market value of eligible real estate used in the calculation of borrowing base. + References No definition available. + Details
Name: | cvti_PercentOfAppraisedFairMarketValueOfEligibleRealEstate
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percent of appraised net orderly liquidation value of eligible revenue equipment used in the calculation of borrowing base. + References No definition available. + Details
Name: | cvti_PercentOfAppraisedNetOrderlyLiquidationValueOfEligibleRevenueEquipment
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of the eligible accounts receivable used in the calculation of borrowing base. + References No definition available. + Details
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Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percent of net book value of eligible revenue equipment used in the calculation of borrowing base. + References No definition available. + Details
Name: | cvti_PercentOfNetBookValueOfEligibleRevenueEquipment
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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- Details
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Period Type: |

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- Details
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- Details
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- Details
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- Details
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