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Note 4 - Discontinued Operations (Details Textual) - Transport Financial Services [Member] - Discontinued Operations, Disposed of by Sale [Member] $ in Millions | Jul. 08, 2020 USD ($)
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Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ 103.3
Disposal Group Including Discontinued Operation Accounts Notes And Loans Receivable Gross | 108.7
Disposal Group, Including Discontinued Operation, Allowance | $ 5.4

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- Definition Represents the disposal group, including discontinued operation accounts notes and loans receivable, gross. + References No definition available. + Details
Name: | cvti_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableGross
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of allowance on accounts receivable, attributable to disposal group held for sale or disposed of, classified as current. + References No definition available. + Details
Name: | cvti_DisposalGroupIncludingDiscontinuedOperationAllowance
Namespace Prefix: | cvti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount classified as accounts, notes and loans receivable attributable to disposal group held for sale or disposed of. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10 -SubTopic 20 -Topic 205 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483475/205-20-45-10 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5B -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483499/205-20-50-5B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 205 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483475/205-20-45-11 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |