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Note 3 - Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
September
3
0
,
2017
   
December 31,
2016
 
Raw materials and in-process
  $
20,406
    $
17,986
 
Finished parts
   
46,126
     
43,423
 
Finished products
   
7,271
     
7,640
 
Total
net inventories
  $
73,803
    $
69,049