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Note 7 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2013
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   

Truck

Segment

   

All Other

   

Totals

 
                         

As of and for the three months ended September 30, 2013

                       
                         

Revenues from external customers

  $ 907,903     $ 5,161     $ 913,064  

Segment income (loss) before taxes

    25,149       (60 )     25,089  

Segment assets

    2,016,725       28,806       2,045,530  
                         

For the nine months ended September 30, 2013

                       
                         

Revenues from external customers

  $ 2,445,151     $ 14,375     $ 2,459,526  

Segment income (loss) before taxes

    56,685       (187 )     56,498  
                         

As of and for the three months ended September 30, 2012

                       
                         

Revenues from external customers

  $ 740,392     $ 4,741     $ 745,133  

Segment income (loss) before taxes

    24,704       (460 )     24,244  

Segment assets

    1,835,675       27,253       1,862,928  
                         

For the nine months ended September 30, 2012

                       
                         

Revenues from external customers

  $ 2,344,073     $ 14,233     $ 2,358,306  

Segment income (loss) before taxes

    79,521       (642 )     78,879