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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories, net:
 
March 31
,
2020
   
December 31,
2019
 
Raw materials and in-process
  $
18,713
    $
16,474
 
Finished parts
   
47,255
     
47,317
 
Finished products
   
11,814
     
12,206
 
Total net inventories
  $
77,782
    $
75,997