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Note 7 - Current and Long-term Debt (Details) (Parentheticals)	Jun. 30, 2015	Dec. 31, 2014
Revenue Equipment Installment Notes [Member]
Interest rate on notes payable	3.70%	3.70%
Real Estate Note [Member]
Interest rate on notes payable	2.50%	2.50%
Other Note Payable [Member]
Interest rate on notes payable	3.00%	3.00%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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 210.5-02.22(a)(1))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cvti_RevenueEquipmentInstallmentNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cvti_RealEstateNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=cvti_OtherNotePayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: