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Note 6 - Derivative Instruments (Details Textual) gal in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) $ / gal	Jun. 30, 2014 $ / gal	Jun. 30, 2015 USD ($) gal	Dec. 31, 2014 USD ($)
Hedge Contracts, Ineffectiveness [Member]
Derivative, Additional Fuel Expense	$ 500,000		$ 900,000
Fuel Hedge Contracts For 2015 Fuel Requirements [Member]
Derivative, Nonmonetary Notional Amount, Volume | gal			6.3
Percent of Projected Fuel Requirements			23.00%
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			9.1
Percent of Projected Fuel Requirements			16.40%
Fuel Hedge Contracts for 2018 Requirements [Member]
Derivative, Nonmonetary Notional Amount, Volume | gal			1.5
Percent of Projected Fuel Requirements			2.70%
Expired or Sold Contracts [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	3,100,000		$ 6,500,000
Additional Fuel Expense No Longer Deemed to be Effective [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 500,000		900,000
Maximum [Member]
Underlying, Derivative Volume | $ / gal	1.98	3.01
Minimum [Member]
Underlying, Derivative Volume | $ / gal	1.62	2.82
Derivative, Collateral Right to Reclaim Cash, Net	$ 0		0	$ 5,000,000
Cash Flow Hedge Derivative Instrument Assets at Fair Value	$ 15,700,000		15,700,000
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ (6,800,000)

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

Name:	cvti_DerivativeCollateralRightToReclaimCashNet
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

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

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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

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

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Balance Type:	na
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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Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
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Period Type:	duration

X

- Details

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X

- 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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- Details

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