The reduction in insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period.

No definition available.

+ Details

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Namespace Prefix:	cvti_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Note 17 - Quarterly Results of Operations (Unaudited) (Details Textual) - USD ($)	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Domestic Tax Authority [Member]
Income Tax Credits and Adjustments		$ 4,700,000
Cargo Claim [Member]
Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve			$ 7,500,000
Reduction in Insurance and Claims Expense	$ 3,600,000