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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts receivable allowance $ 1,345 $ 1,857
Drivers' advances and other receivables, allowance $ 519 $ 1,005
Treasury stock, shares (in shares) 23,656 149,498
Common Class A [Member]    
Par value (in dollars per share) $ 0.01 $ 0.01
Shares authorized (in shares) 20,000,000 20,000,000
Shares issued (in shares) 15,922,879 15,922,879
Shares outstanding (in shares) 15,899,223 15,773,381
Common Class B [Member]    
Par value (in dollars per share) $ 0.01 $ 0.01
Shares authorized (in shares) 5,000,000 5,000,000
Shares issued (in shares) 2,350,000 2,350,000
Shares outstanding (in shares) 2,350,000 2,350,000