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Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2015
Aug. 03, 2015
Common Class B [Member]    
Entity Common Stock, Shares Outstanding (in shares)   2,350,000
Common Class A [Member]    
Entity Common Stock, Shares Outstanding (in shares)   15,922,879
Entity Registrant Name COVENANT TRANSPORTATION GROUP INC  
Entity Central Index Key 0000928658  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Document Type 10-Q  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Amendment Flag false