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Note 17 - Quarterly Results of Operations (Unaudited) (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2015 | Mar. 31, 2015
Reduction in Insurance and Claims Expense | $ 3,600 |
Domestic Tax Authority [Member] |  |
Income Tax Credits and Adjustments |  | $ 4,700

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- Definition The reduction in insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period. + References No definition available. + Details
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Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_IncomeTaxCreditsAndAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |