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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
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 15,746,609
Shares outstanding (in shares) 15,773,381 15,746,609
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 15,746,609
Shares outstanding (in shares) 15,773,381 15,746,609
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
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
Accounts receivable allowance $ 1,857 $ 1,767
Drivers' advances and other receivables, allowance $ 1,005 $ 1,290
Treasury stock, shares (in shares) 149,498 0