Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Mar. 02, 2015
Document Information [Line Items]
Entity Registrant Name	COVENANT TRANSPORTATION GROUP INC
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Public Float		$ 107,000,000
Amendment Flag	false
Entity Central Index Key	0000928658
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			15,790,902
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding			2,350,000