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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) | Aug. 26, 2014 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Cargo Claim [Member] |  |  |
Litigation Settlement, Amount | $ 5,900,000 |  |
Letters of Credit Outstanding, Amount |  | $ 26,800,000 | $ 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: |