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Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts receivable allowance $ 1,856 $ 1,985
Driver's advances and other receivables, allowance $ 648 $ 626
Common Class A [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 40,000,000 20,000,000
Common stock, shares issued (in shares) 16,096,235 16,015,708
Common stock, shares outstanding (in shares) 16,096,235 16,015,708
Common Class B [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 5,000,000 5,000,000
Common stock, shares issued (in shares) 2,350,000 2,350,000
Common stock, shares outstanding (in shares) 2,350,000 2,350,000