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Note 7 - Segment Information (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Truck
Segment
   
All Other
   
Total
 
As of
and for
the three months ended June 30,
201
8
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $
1,344,271
    $
4,560
    $
1,348,831
 
Segment operating income
   
43,126
     
300
     
43,426
 
Segment income before taxes
   
38,684
     
248
     
38,932
 
Segment assets
   
2,981,063
     
35,400
     
3,016,463
 
                         
For
the six months ended June 30,
201
8
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $
2,580,924
    $
8,688
    $
2,589,612
 
Segment operating income
   
75,486
     
329
     
75,815
 
Segment income before taxes
   
66,787
     
228
     
67,015
 
                         
As of
and for
the three months ended June 30, 201
7
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $
1,199,703
    $
3,821
    $
1,203,523
 
Segment operating income (loss)
   
37,546
     
(139
)    
37,407
 
Segment income (loss) before taxes
   
34,766
     
(183
)    
34,583
 
Segment assets
   
2,655,860
     
35,939
     
2,691,799
 
                         
For
the six months ended June 30, 201
7
 
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
  $
2,240,556
    $
7,764
    $
2,248,320
 
Segment operating income (loss)
   
62,540
     
(284
)    
62,256
 
Segment income (loss) before taxes
   
57,010
     
(368
)    
56,641