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v2.4.0.6

Note 7 - Debt (Detail) - Prior Pricing (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Average Excess Availability (in Dollars) |  | 52,700,000
Maximum [Member] | Level II [Member] |  |
Average Excess Availability (in Dollars) | 75,000,000 | 70,000,000
Maximum [Member] | Level III [Member] |  |
Average Excess Availability (in Dollars) | 50,000,000 | 35,000,000
Maximum [Member] | Level IV [Member] |  |
Average Excess Availability (in Dollars) | 25,000,000 | 20,000,000
Maximum [Member] | Level V [Member] |  |
Average Excess Availability (in Dollars) |  | 10,000,000
Minimum [Member] | Level I [Member] |  |
Average Excess Availability (in Dollars) | 75,000,000 | 70,000,000
Minimum [Member] | Level II [Member] |  |
Average Excess Availability (in Dollars) | 50,000,000 | 35,000,000
Minimum [Member] | Level III [Member] |  |
Average Excess Availability (in Dollars) | 25,000,000 | 20,000,000
Minimum [Member] | Level IV [Member] |  |
Average Excess Availability (in Dollars) |  | 10,000,000
Level I [Member] |  |
Base Rate Loans | 0.50% | 1.25%
LIBOR Loans | 1.50% | 2.25%
Level II [Member] |  |
Base Rate Loans | 0.75% | 1.50%
LIBOR Loans | 1.75% | 2.50%
Level III [Member] |  |
Base Rate Loans | 1.00% | 1.75%
LIBOR Loans | 2.00% | 2.75%
Level IV [Member] |  |
Base Rate Loans | 1.25% | 2.00%
LIBOR Loans | 2.25% | 3.00%
Level V [Member] |  |
Base Rate Loans |  | 2.25%
LIBOR Loans |  | 3.25%

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | cvti_LIBORLoans
Namespace Prefix: | cvti_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant