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Note 1 - Significant Accounting Policies (Details Textual) - Reclassification of Debt Issuance Costs from Other Assets to Long-term Notes Payable [Member] $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
December 31, 2015 [Member]
Prior Period Reclassification Adjustment	$ 0.7
Current Period Reclassification Adjustment	$ 0.7

X

- Definition

The amount of a reclassification adjustment made to current period financial statement amounts.

+ References

No definition available.

+ Details

Name:	cvti_CurrentPeriodReclassificationAdjustment
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of a reclassification adjustment made to prior period financial statement amounts.

+ References

No definition available.

+ Details

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=cvti_ReclassificationOfDebtIssuanceCostsFromOtherAssetsToLongtermNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreationDateAxis=cvti_December312015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: