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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)		3 Months Ended	9 Months Ended
	Aug. 26, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Apr. 30, 2015	Dec. 31, 2014
Cargo Claim [Member]
Litigation Settlement, Amount	$ 5,900,000
Loss Contingency, Range of Possible Loss, Maximum					$ 20,000,000
Refund on Commutation of Auto Liability Insurance Policy		$ 3,600,000	$ 3,600,000
Letters of Credit Outstanding, Amount			$ 33,400,000			$ 34,300,000

X

- Definition

Represents where in exchange for a credit of a portion of the previous insurance premiums we had paid to the insurer we have released them from liability for any claims that may have been incurred during the agreed upon period up to certain limitations.

+ References

No definition available.

+ Details

Name:	cvti_RefundonCommutationofAutoLiabilityInsurancePolicy
Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

- 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

- Definition

The estimated maximum amount of possible loss from the contingency.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 50



-Paragraph 4



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 450



-SubTopic 20



-Section 50



-Paragraph 9



-Subparagraph (b)



-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

Name:	us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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