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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Accounts receivable allowance $ 3,690 $ 4,112
Driver's advances and other receivables, allowance $ 570 $ 542
Treasury stock, shares (in shares) 4,546,900 1,711,627
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) 16,125,786 16,125,786
Common stock, shares outstanding (in shares) 11,578,886 14,414,159
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