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Note 6 - Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 21.8 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue |  |
Derivative, Collateral, Right to Reclaim Cash, Net | 2.9 cvti_DerivativeCollateralRightToReclaimCashNet |  | 5.0 cvti_DerivativeCollateralRightToReclaimCashNet
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (3.4)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet |  |
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net | (0.1)us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | (8.3)us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths |  |
Hedge Contracts Ineffectiveness [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Additional Fuel Expense | (0.3)cvti_DerivativeAdditionalFuelExpense / us-gaap_StatementScenarioAxis = cvti_HedgeContractsIneffectivenessMember |  |
Gallons of Diesel [Member] | Maximum [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Underlying, Derivative Volume (in Dollars per US Gallon) | 1.97 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.08 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Gallons of Diesel [Member] | Minimum [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Underlying, Derivative Volume (in Dollars per US Gallon) | 1.44 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeByNatureAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Gallons of Diesel [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Underlying, Derivative Volume (in Dollars per US Gallon) |  | 2.85 us-gaap_UnderlyingDerivativeVolume / us-gaap_DerivativeInstrumentRiskAxis = cvti_GallonsOfDieselMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Fuel Hedge Contracts for 2015 Fuel Requirements [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume (in US Gallons) | 9,500,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeInstrumentRiskAxis = cvti_FuelHedgeContractsFor2015FuelRequirementsMember |  |
Percent of Projected Fuel Requirements | 22.90%cvti_PercentOfProjectedFuelRequirements / us-gaap_DerivativeInstrumentRiskAxis = cvti_FuelHedgeContractsFor2015FuelRequirementsMember |  |
Fuel Hedge Contracts for 2016 Fuel Requirements [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume (in US Gallons) | 12,100,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeInstrumentRiskAxis = cvti_FuelHedgeContractsFor2016FuelRequirementsMember |  |
Percent of Projected Fuel Requirements | 21.90%cvti_PercentOfProjectedFuelRequirements / us-gaap_DerivativeInstrumentRiskAxis = cvti_FuelHedgeContractsFor2016FuelRequirementsMember |  |
Fuel Hedge Contracts for 2017 Fuel Requirements [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative, Nonmonetary Notional Amount, Volume (in US Gallons) | 7,600,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeInstrumentRiskAxis = cvti_FuelHedgeContractsFor2017FuelRequirementsMember |  |
Percent of Projected Fuel Requirements | 13.70%cvti_PercentOfProjectedFuelRequirements / us-gaap_DerivativeInstrumentRiskAxis = cvti_FuelHedgeContractsFor2017FuelRequirementsMember |  |
Expired or Sold contracts [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | (3.4)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = cvti_ExpiredOrSoldContractsMember |  |
Additional Fuel Expense, no Longer Deemed to be Effective [Member] |  |  |
Note 6 - Derivative Instruments (Details) [Line Items] |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 0.3 us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = cvti_AdditionalFuelExpenseNoLongerDeemedToBeEffectiveMember |  |

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
Name: | cvti_Note6DerivativeInstrumentsDetailsLineItems
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=56946850&loc=SL5624163-113959 + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
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
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
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=56946850&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=56946850&loc=SL5624177-113959 + Details
Name: | us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix: | us-gaap_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. + 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)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 + Details
Name: | us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
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

X
- Details
Name: | us-gaap_DerivativeByNatureAxis=cvti_GallonsOfDieselMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cvti_AdditionalFuelExpenseNoLongerDeemedToBeEffectiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cvti_ExpiredOrSoldContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cvti_FuelHedgeContractsFor2015FuelRequirementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cvti_FuelHedgeContractsFor2016FuelRequirementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cvti_FuelHedgeContractsFor2017FuelRequirementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=cvti_HedgeContractsIneffectivenessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |