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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories, net:
 
September
3
0
,
2019
   
December 31,
2018
 
Raw materials and in-process
  $
14,809
    $
21,773
 
Finished parts
   
48,384
     
54,209
 
Finished products
   
10,406
     
11,405
 
Total net inventories
  $
73,599
    $
87,387