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Note 7 - Segment Information (Tables)
3 Months Ended
Mar. 31, 2019
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
9
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $
1,344,449
    $
3,868
    $
1,348,317
 
Segment operating income
   
56,742
     
125
     
56,867
 
Segment income before taxes
   
49,505
     
53
     
49,558
 
Segment assets
   
3,384,441
     
37,585
     
3,422,026
 
                         
As of and for the three months ended March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $
1,236,652
    $
4,129
    $
1,240,781
 
Segment operating income
   
32,360
     
29
     
32,389
 
Segment income (loss) before taxes
   
28,103
     
(20
)    
28,083
 
Segment assets
   
2,864,504
     
34,700
     
2,899,204