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Note 7 - Segment Information (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
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,
2015
 
 
 
 
 
 
 
 
 
 
 
 
                         
Revenues from external customers
  $ 1,289,929     $ 4,147     $ 1,294,076  
Segment income (loss) before taxes
    33,069       (607 )     32,462  
Segment assets
    2,837,256       33,234       2,870,490  
                         
For the nine months ended September 30,
2015
 
 
 
 
 
 
 
 
 
 
 
 
                         
Revenues from external customers
  $ 3,806,276     $ 11,638     $ 3,817,914  
Segment income (loss) before taxes
    92,981       (1,169 )     91,812  
                         
As of and for the three months ended September 30,
2014
 
 
 
 
 
 
 
 
 
 
 
 
                         
Revenues from external customers
  $ 1,236,101     $ 4,921     $ 1,241,022  
Segment income (loss) before taxes
    38,366       (37 )     38,329  
Segment assets
    2,426,368       30,244       2,456,612  
                         
For the nine months ended September 30,
2014
 
 
 
 
 
 
 
 
 
 
 
 
                         
Revenues from external customers
  $ 3,368,037     $ 14,113     $ 3,382,150  
Segment income (loss) before taxes
    90,459       (126 )     90,333