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Note 17 - Quarterly Results of Operations (Unaudited) (Details) (USD $)	12 Months Ended			3 Months Ended	0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Aug. 26, 2014	Sep. 30, 2014
Note 17 - Quarterly Results of Operations (Unaudited) (Details) [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment	$ 33,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment	$ (81,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment	$ (198,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Terminal Property [Member]
Note 17 - Quarterly Results of Operations (Unaudited) (Details) [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment				2,400,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = cvti_TerminalPropertyMember
Cargo Claim [Member]
Note 17 - Quarterly Results of Operations (Unaudited) (Details) [Line Items]
Increase (Decrease) in Loss and Loss Adjustment Expense Reserve					$ 7,500,000us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember	$ 8,100,000us-gaap_IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

The increase (decrease) during the reporting period in the reserve account established to account for expected but unspecified losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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