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Condensed Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accounts Receivable Allowance (in Dollars) $ 1,662 $ 1,729
Drivers' Advances and Other Receivables Allowance (in Dollars) $ 1,143 $ 1,041
Treasury stock shares 973,657 1,059,643
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 12,495,433 12,409,447
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