XML 63 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Mar. 09, 2020
Jun. 28, 2019
Document Information [Line Items]      
Entity Registrant Name COVENANT TRANSPORTATION GROUP INC    
Entity Central Index Key 0000928658    
Trading Symbol cvti    
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    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Interactive Data Current Yes    
Entity Public Float     $ 157.2
Entity Shell Company false    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Title of 12(b) Security $0.01 Par Value Class A common stock    
Common Class B [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   2,350,000  
Common Class A [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   16,166,822