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Note 9 - Equity Method Investment (Details) (USD $) | 3 Months Ended | 0 Months Ended | 1 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | May 31, 2011 | May 31, 2011 | Dec. 31, 2014
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Income (Loss) from Equity Method Investments | $ 1,385,000 us-gaap_IncomeLossFromEquityMethodInvestments | $ 800,000 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |
Accrued Liabilities, Current | 31,743,000 us-gaap_AccruedLiabilitiesCurrent |  |  |  | 39,470,000 us-gaap_AccruedLiabilitiesCurrent
Proceeds from Sale of Property, Plant, and Equipment | 11,042,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 19,920,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |  |  |
Based On 2011 Results [Member] | Transport Enterprise Leasing, LLC [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  | 1,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = cvti_BasedOn2011ResultsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember | 1,000,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_ContingentConsiderationByTypeAxis = cvti_BasedOn2011ResultsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |
Based On 2012 Results [Member] | Transport Enterprise Leasing, LLC [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 2,400,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ContingentConsiderationByTypeAxis = cvti_BasedOn2012ResultsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |
Scenario, Forecast [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Option To Acquire Interest In Equity Method Investment, Percentage of Ownership | 100.00%cvti_OptionToAcquireInterestInEquityMethodInvestmentPercentageOfOwnership / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |  |  |  |
Transport Enterprise Leasing, LLC [Member] | Services Provided [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Revenue from Related Parties | 300,000 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionAxis = cvti_ServicesProvidedMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  |
Transport Enterprise Leasing, LLC [Member] | Reduction In TEI Investment [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Deferred Gain on Sale of Property | 900,000 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_BalanceSheetLocationAxis = cvti_ReductionInTEIInvestmentMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  |
Transport Enterprise Leasing, LLC [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember | 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |
Payments to Acquire Equity Method Investments | 4,900,000 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  | 1,500,000 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | 4,500,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember | 4,500,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |
Income (Loss) from Equity Method Investments | 1,400,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  |
Proceeds from Sale of Property, Plant, and Equipment | 3,600,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  |
Deferred Gain on Sale of Property | 100,000 us-gaap_DeferredGainOnSaleOfProperty / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  |
Due from Related Parties | 2,900,000 us-gaap_DueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  | 2,200,000 us-gaap_DueFromRelatedParties / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember
Equity Method Investments | 13,500,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember |  |  |  | 12,200,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cvti_TransportEnterpriseLeasingLLCMember
Earnout [Member] |  |  |  |  |
Note 9 - Equity Method Investment (Details) [Line Items] |  |  |  |  |
Accrued Liabilities, Current | $ 0 us-gaap_AccruedLiabilitiesCurrent / us-gaap_NatureOfExpenseAxis = cvti_EarnoutMember |  |  |  |

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- Definition The option to acquire ownership interest in the equity method investment pursuant to the agreement, percentage of ownership interest. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.U.Q2) -URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791 + Details
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- Definition For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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 (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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