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Note 3 - Inventories (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
March 31,
2017
 
 
December 31,
201
6
 
Raw materials and in-process
  $
15,671
    $
17,986
 
Finished parts
   
45,402
     
43,423
 
Finished products
   
6,957
     
7,640
 
Total inventories
  $
68,030
    $
69,049