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Note C - Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories, net
 
2016
   
2015
 
Raw materials and in-process
  $
17,986
    $
25,652
 
Finished parts
   
43,423
     
46,270
 
Finished products
   
7,640
     
10,896
 
Total net inventories
  $
69,049
    $
82,818