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Note 9 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 9 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Deferred Tax Assets, Net, Current $ 14,700,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent    
Deferred Tax Liabilities, Net, Noncurrent 73,717,000us-gaap_DeferredTaxLiabilitiesNoncurrent 59,077,000us-gaap_DeferredTaxLiabilitiesNoncurrent  
Deferred Tax Liabilities, Net 59,004,000us-gaap_DeferredTaxLiabilities 53,843,000us-gaap_DeferredTaxLiabilities  
Deferred Tax Assets, Valuation Allowance 1,001,000us-gaap_DeferredTaxAssetsValuationAllowance 983,000us-gaap_DeferredTaxAssetsValuationAllowance  
Liability for Uncertain Tax Positions, Current 1,600,000us-gaap_LiabilityForUncertainTaxPositionsCurrent 1,800,000us-gaap_LiabilityForUncertainTaxPositionsCurrent  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 700,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Income Tax Expense (Benefit) 14,774,000us-gaap_IncomeTaxExpenseBenefit 7,503,000us-gaap_IncomeTaxExpenseBenefit 6,335,000us-gaap_IncomeTaxExpenseBenefit
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,200,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Interest and Penalties Recognized for Uncertain Tax Positions [Member]      
Note 9 - Income Taxes (Details) [Line Items]      
Income Tax Expense (Benefit) 100,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeStatementLocationAxis
= cvti_InterestAndPenaltiesRecognizedForUncertainTaxPositionsMember		 (300,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeStatementLocationAxis
= cvti_InterestAndPenaltiesRecognizedForUncertainTaxPositionsMember		 (300,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_IncomeStatementLocationAxis
= cvti_InterestAndPenaltiesRecognizedForUncertainTaxPositionsMember
Domestic Tax Authority [Member]      
Note 9 - Income Taxes (Details) [Line Items]      
Deferred Tax Assets, Valuation Allowance 0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 0us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		  
State and Local Jurisdiction [Member]      
Note 9 - Income Taxes (Details) [Line Items]      
Deferred Tax Assets, Valuation Allowance $ 1,000,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 $ 1,000,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember