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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
                 
New commercial vehicles
  $
976,464
    $
747,531
 
Used commercial vehicles
   
96,126
     
76,488
 
Parts and accessories
   
259,396
     
205,534
 
Other
   
19,573
     
15,924
 
Less allowance
   
(11,636
)    
(12,183
)
                 
Total
  $
1,339,923
    $
1,033,294