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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accounts receivable allowance $ 2,213 $ 1,944
Driver's advances and other receivables, allowance $ 719 $ 692
Treasury stock, shares (in shares) 1,429,204 0
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 40,000,000
Common stock, shares issued (in shares) 16,166,828 16,165,145
Common stock, shares outstanding (in shares) 14,737,624 16,165,145
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