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Note 5 - Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Note 5 - Fair Value of Financial Instruments (Details) [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash, Net | $ 2.9 cvti_DerivativeCollateralRightToReclaimCashNet | $ 5.0 cvti_DerivativeCollateralRightToReclaimCashNet
Trade Receivables Held-for-sale, Net, Not Part of Disposal Group | 15.5 us-gaap_TradeReceivablesHeldForSaleNetNotPartOfDisposalGroup |
Allowance for Doubtful Accounts Receivable | 0.2 us-gaap_AllowanceForDoubtfulAccountsReceivable |
Collateral for Collection Issues [Member] |  |
Note 5 - Fair Value of Financial Instruments (Details) [Line Items] |  |
Accounts Payable | $ 0.5 us-gaap_AccountsPayableCurrentAndNoncurrent / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = cvti_CollateralForCollectionIssuesMember |

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

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

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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount, after allowance for bad debt, of trade receivables held-for-sale that are not part of a disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + 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: |