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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September 30,
2018
   
December 31,
2017
 
Raw materials and in-process
  $
22,039
    $
17,528
 
Finished parts
   
50,525
     
48,247
 
Finished products
   
9,480
     
9,192
 
Total net inventories
  $
82,044
    $
74,967