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Note 6 - Derivative Instruments (Details Textual) gal in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) $ / gal	Sep. 30, 2014 $ / gal	Sep. 30, 2015 USD ($) gal	Aug. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net			$ (100,000)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (100,000)
Derivative, Notional Amount				$ 28,000,000
Derivative, Fixed Interest Rate				4.20%
Derivative Instruments in Hedges, Liabilities, at Fair Value	1,300,000		1,300,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred			(400,000)
Hedge Contracts, Ineffectiveness [Member]
Derivative, Additional Fuel Expense	300,000		$ 1,200,000
Fuel Hedge Contracts For 2015 Fuel Requirements [Member]
Derivative, Nonmonetary Notional Amount, Volume | gal			3.1
Percent of Projected Fuel Requirements			22.50%
Fuel Hedge Contracts for 2016 Fuel Requirements [Member]
Derivative, Nonmonetary Notional Amount, Volume | gal			12.1
Percent of Projected Fuel Requirements			21.90%
Fuel Hedge Contracts for 2017 Fuel Requirements [Member]
Derivative, Nonmonetary Notional Amount, Volume | gal			10.6
Percent of Projected Fuel Requirements			19.20%
Fuel Hedge Contracts for 2018 Requirements [Member]
Derivative, Nonmonetary Notional Amount, Volume | gal			4.5
Percent of Projected Fuel Requirements			8.20%
Expired or Sold Contracts [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	4,200,000		$ 10,700,000
Additional Fuel Expense No Longer Deemed to be Effective [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 300,000		1,200,000
Maximum [Member]
Underlying, Derivative Volume | $ / gal	1.77	2.91
Minimum [Member]
Underlying, Derivative Volume | $ / gal	1.32	2.62
Derivative, Collateral Right to Reclaim Cash, Net	$ 0		0		$ 5,000,000
Cash Flow Hedge Derivative Instrument Assets at Fair Value	$ 22.10		22.10
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ 8,900,000

X

- Definition

Represents the amount of the additional fuel expense related to the fuel hedge contracts.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of right to receive cash collateral under master netting arrangements that has been offset against derivative liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of estimated annual fuel requirements hedged for the remainder of the period.

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Article 12



-Section 13



-Sentence Column B

+ Details

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X

- Definition

Fair value of all asset derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4B



-Subparagraph (c)(1)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 30



-Section 50



-Paragraph 1



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

No definition available.

+ Details

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X

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4C



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4D



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624177-113959

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- Definition

Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 825



-SubTopic 10



-Section 50



-Paragraph 10



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

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X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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