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Condensed Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts receivable allowance (in Dollars) $ 1,732 $ 1,736
Drivers' advances and other receivables, allowance (in Dollars) $ 1,414 $ 1,337
Treasury stock shares 894,091 909,387
Common Class A [Member]
    
Par value (in Dollars per share) $ 0.01 $ 0.01
Shares authorized 20,000,000 20,000,000
Shares issued 13,469,090 13,469,090
Shares Outstanding 12,574,999 12,559,703
Common Class B [Member]
    
Par value (in Dollars per share) $ 0.01 $ 0.01
Shares authorized 5,000,000 5,000,000
Shares issued 2,350,000 2,350,000
Shares Outstanding 2,350,000 2,350,000