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Note 13 - Derivative Instruments (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 22,700,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue | $ 1,400,000 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (3,100,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | 600,000 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet | 3,100,000 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net | 100,000 us-gaap_GainLossFromComponentsExcludedFromAssessmentOfCashFlowHedgeEffectivenessNet |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | 8,000,000 us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |  |
Derivative, Collateral, Right to Reclaim Cash, Net | 5,000,000 cvti_DerivativeCollateralRightToReclaimCashNet | 0.0 cvti_DerivativeCollateralRightToReclaimCashNet |
Gallons of Diesel [Member] | Fuel Requirements 2015 [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Number of Instruments Held | 12,600,000 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_OtherCommitmentsAxis = cvti_FuelRequirements2015Member |  |
Gallons of Diesel [Member] | Fuel Requirements 2016 [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Number of Instruments Held | 12,100,000 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_OtherCommitmentsAxis = cvti_FuelRequirements2016Member |  |
Gallons of Diesel [Member] | Fuel Requirements 2017 [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Number of Instruments Held | 3,000,000 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_OtherCommitmentsAxis = cvti_FuelRequirements2017Member |  |
Gallons of Diesel [Member] | Minimum [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Underlying, Derivative Volume (in Dollars per Item) | 3.08 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 3.29 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Gallons of Diesel [Member] | Maximum [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Underlying, Derivative Volume (in Dollars per Item) | 1.58 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 2.72 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fuel Requirements 2015 [Member] | Gallons of Diesel [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Percent of Projected Fuel Requirements | 23.00%cvti_PercentOfProjectedFuelRequirements / us-gaap_DerivativeInstrumentRiskAxis = cvti_GallonsOfDieselMember / us-gaap_OtherCommitmentsAxis = cvti_FuelRequirements2015Member |  |
Fuel Requirements 2016 [Member] | Gallons of Diesel [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Percent of Projected Fuel Requirements | 22.00%cvti_PercentOfProjectedFuelRequirements / us-gaap_DerivativeInstrumentRiskAxis = cvti_GallonsOfDieselMember / us-gaap_OtherCommitmentsAxis = cvti_FuelRequirements2016Member |  |
Fuel Requirements 2017 [Member] | Gallons of Diesel [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Percent of Projected Fuel Requirements | 5.00%cvti_PercentOfProjectedFuelRequirements / us-gaap_DerivativeInstrumentRiskAxis = cvti_GallonsOfDieselMember / us-gaap_OtherCommitmentsAxis = cvti_FuelRequirements2017Member |  |
Hedge Contracts Ineffectiveness [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Additional Fuel Expense | 1,400,000 cvti_DerivativeAdditionalFuelExpense / us-gaap_StatementScenarioAxis = cvti_HedgeContractsIneffectivenessMember |  |
Expired or Sold contracts [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (1,500,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = cvti_ExpiredOrSoldContractsMember |  |
Additional Fuel Expense, no Longer Deemed to be Effective [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (1,400,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = cvti_AdditionalFuelExpenseNoLongerDeemedToBeEffectiveMember |  |
Additional Fuel Expense, Unfavorable Ineffectiveness [Member] |  |  |
Note 13 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ (200,000)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = cvti_AdditionalFuelExpenseUnfavorableIneffectivenessMember |  |

X
- Definition Represents the amount of the additional fuel expense related to the fuel hedge contracts. + References No definition available. + Details
Name: | cvti_DerivativeAdditionalFuelExpense
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of right to receive cash collateral under master netting arrangements that has been offset against derivative liabilities. + References No definition available. + Details
Name: | cvti_DerivativeCollateralRightToReclaimCashNet
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | cvti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of estimated annual fuel requirements hedged for the remainder of the period. + References No definition available. + Details
Name: | cvti_PercentOfProjectedFuelRequirements
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself. + References No definition available. + Details
Name: | us-gaap_UnderlyingDerivativeVolume
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

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- Details
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X
- Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=cvti_FuelRequirements2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |