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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)	Aug. 26, 2014	Mar. 31, 2016	Dec. 31, 2015
Cargo Claim [Member]
Litigation Settlement, Amount	$ 5,900,000
Letters of Credit Outstanding, Amount		$ 31,300,000	$ 31,400,000

X

- 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

X

- Definition

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LitigationCaseAxis=cvti_CargoClaimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: