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Note 10 - Commitments and Contingencies (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2017
Letters of Credit Outstanding, Amount			$ 35,100,000	$ 32,900,000
Cargo Claim [Member] | Scenario, Forecast [Member]
Payments for Legal Settlements		$ 6,800,000
Cargo Claim [Member] | Judicial Ruling [Member]
Increase (Decrease) in Estimated Litigation Liability	$ 900,000

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

- Definition

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
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: