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Note 7 - Segment Information (Tables)
3 Months Ended
Mar. 31, 2014
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 March 31, 2014

                       
                         

Revenues from external customers

  $ 954,407     $ 4,260     $ 958,667  

Segment income (loss) before taxes

    19,759       (144 )     19,615  

Segment assets

    2,233,510       30,210       2,263,720  
                         

As of and for the three months ended March 31, 2013

                       
                         

Revenues from external customers

  $ 752,230     $ 4,558     $ 756,788  

Segment income (loss) before taxes

    22,148       (48 )     22,100  

Segment assets

    1,835,123       26,192       1,861,315