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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories, net
 
December 31,
201
9
   
December 31,
2018
 
Raw materials and in-process
  $
16,474
    $
21,773
 
Finished parts
   
47,317
     
54,209
 
Finished products
   
12,206
     
11,405
 
Total net inventories
  $
75,997
    $
87,387