Debt secured with a cross default feature.

No definition available.

Name:	cvti_DebtSecuredWithACrossDefaultFeature
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the fixed charge coverage requirement.

+ References

No definition available.

+ Details

Name:	cvti_FixedChargeCoverageRequirement
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- Definition

Percent of the eligible accounts receivable used in the calculation of borrowing base.

+ References

No definition available.

+ Details

Name:	cvti_PercentOfEligibleAccountsReceivable
Namespace Prefix:	cvti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

- 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

Name:	us-gaap_CommodityContractAssetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ 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(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cvti_SwingLineSubFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cvti_WhenAvailabilityIsLessThan50MillionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cvti_WhenAvailabilityIsAtLeast50MillionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cvti_TestingOfFixedChargeCoverageRatioCovenantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cvti_CashDominionAppliesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvti_EighthAmendmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cvti_TransportEnterpriseLeasingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cvti_BaseRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=cvti_ApplicableMarginMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=cvti_FederalFundsRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Note 7 - Debt (Details Textual) - USD ($)	1 Months Ended	6 Months Ended	12 Months Ended
Note 7 - Debt (Details Textual) - USD ($)	Jan. 31, 2013	Jun. 30, 2015	Dec. 31, 2014	May. 31, 2011	Sep. 30, 2008
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 85,000,000
Swing Line Sub Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 10,000,000
Percent of Aggregate Commitments under Credit Facility					10.00%
When Availability is less than 50 Million [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%
When Availability is at least 50 Million [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Testing of Fixed Charge Coverage Ratio Covenant [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	12.50%
Line of Credit Facility, Revolver Commitment, Amount	$ 11,900,000
Cash Dominion Applies [Member]
Line of Credit Facility, Revolver Commitment, Amount	$ 14,300,000
Line of Credit Facility, Availability as Percentage of Revolver Commitment	15.00%
Eighth Amendment [Member] \| Maximum [Member] \| Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage	51.00%
Eighth Amendment [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 95,000,000
Base Rate Loans [Member] \| Maximum [Member] \| Applicable Margin [Member]
Debt Instrument, Basis Spread on Variable Rate		1.25%
Base Rate Loans [Member] \| Minimum [Member] \| Applicable Margin [Member]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Base Rate Loans [Member] \| Federal Funds Rate [Member]
Debt Instrument, Basis Spread on Variable Rate		0.50%
Base Rate Loans [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.00%
LIBOR [Member] \| Maximum [Member] \| Applicable Margin [Member]
Debt Instrument, Basis Spread on Variable Rate		2.25%
LIBOR [Member] \| Minimum [Member] \| Applicable Margin [Member]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Maximum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Minimum [Member]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.375%
Transport Enterprise Leasing LLC [Member]
Equity Method Investment, Ownership Percentage				49.00%
Fixed Charge Coverage Requirement		$ 0	$ 0
Long-term Line of Credit		0
Line of Credit Facility, Maximum Borrowing Capacity					$ 85,000,000
Line of Credit Facility, Maximum Increase in Borrowing Capacity					$ 50,000,000
Line of Credit Facility, Availability Block Removed	15,000,000
Line of Credit Facility, Revolver Commitment, Amount		$ 25,000,000
Line of Credit Facility, Availability as Percentage of Revolver Commitment		35.00%
Maximum Stock Repurchase, Aggregate Amount Allowed Pursuant to Credit Facility Agreement	5,000,000
Debt Instrument, Fee Amount	$ 300,000
Percent of Eligible Accounts Receivable		85.00%
Percent of Appraised Net Orderly Liquidation, Value of Eligible Revenue Equipment		85.00%
Percent of Net Book Value of Eligible Revenue Equipment		95.00%
Percent of Appraised Fair Market Value of Eligible Real Estate		65.00%
Letters of Credit Outstanding, Amount		$ 33,400,000	$ 34,300,000
Line of Credit Facility, Remaining Borrowing Capacity		50,000,000
Debt, Secured with a Cross Default Feature		136,100,000
Commodity Contract Asset, Current		$ 11,200,000