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Note 3 - Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
June 30,
2017
 
 
December 31,
2016
 
Raw materials and in-process
  $
18,254
    $
17,986
 
Finished parts
   
41,850
     
43,423
 
Finished products
   
6,677
     
7,640
 
Total net inventories
  $
66,781
    $
69,049