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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Jun. 30, 2018	Dec. 31, 2017
Letters of Credit Outstanding, Amount		$ 36,800	$ 32,900
Cargo Claim [Member] | Judicial Ruling [Member]
Increase (Decrease) in Estimated Litigation Liability	$ 900

X

- Definition

The increase (decrease) during the period in the estimated litigation liability.

+ References

No definition available.

+ Details

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

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

- Details

Name:	srt_LitigationCaseAxis=cvti_CargoClaimMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LitigationStatusAxis=us-gaap_JudicialRulingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: