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Note 10 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 0 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Aug. 26, 2014 | Sep. 30, 2014 | Mar. 31, 2015 | Dec. 31, 2014
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 37.0 us-gaap_LettersOfCreditOutstandingAmount | $ 34.3 us-gaap_LettersOfCreditOutstandingAmount
Insurance Policy, Term | 3 years |  |  |  |
Subsequent Event [Member] |  |  |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |  |  |
Insurance Policy, Primary Occurence Limit | 1.0 cvti_InsurancePolicyPrimaryOccurenceLimit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Insurance Policy, Excess Coverage | 75.0 cvti_InsurancePolicyExcessCoverage / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum | 20.0 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Cargo Claim [Member] |  |  |  |  |
Note 10 - Commitments and Contingencies (Details) [Line Items] |  |  |  |  |
Litigation Settlement, Amount |  | 5.9 us-gaap_LitigationSettlementAmount / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember |  |  |
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve |  | $ 7.5 us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember | $ 8.1 us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve / us-gaap_LitigationCaseAxis = cvti_CargoClaimMember |  |

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- Definition Represents the excess coverage from the insurance policy. + References No definition available. + Details
Name: | cvti_InsurancePolicyExcessCoverage
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The policy retains the first amount for the primary layer of the auto liability program. + References No definition available. + Details
Name: | cvti_InsurancePolicyPrimaryOccurenceLimit
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The term of the insurance policy. + References No definition available. + Details
Name: | cvti_InsurancePolicyTerm
Namespace Prefix: | cvti_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | cvti_Note10CommitmentsandContingenciesDetailsLineItems
Namespace Prefix: | cvti_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
- Definition The estimated maximum amount of possible loss from the contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 + Details
Name: | us-gaap_LossContingencyRangeOfPossibleLossMaximum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LitigationCaseAxis=cvti_CargoClaimMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |