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

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

Name:	cvti_BaseRateLoans
Namespace Prefix:	cvti_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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