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Consolidated Condensed Balance Sheets(Unaudited) (Parentheticals) (USD $)
In Thousands, except Per Share data
Jun. 30, 2011
Dec. 31, 2010
Accounts Receivable Allowance (in Dollars) $ 1,448 $ 1,537
Drivers' Advances and Other Receivables Allowance (in Dollars) $ 2,476 $ 2,499
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 12,364,437 12,190,682
Treasury stock shares 1,104,653 1,278,408
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