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Note 7 - Segment Information (Tables)
3 Months Ended
Mar. 31, 2016
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 March 31, 201
6
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $ 1,067,290     $ 3,550     $ 1,070,840  
Segment income (loss) before taxes
    4,370       (428 )     3,942  
Segment assets
    2,764,294       32,498       2,796,792  
                         
As of and for the three months ended March 31, 201
5
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $ 1,189,987     $ 3,548     $ 1,193,535  
Segment income (loss) before taxes
    27,752       (364 )     27,388  
Segment assets
    2,708,600       30,123       2,738,723