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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories
, net
 
201
7
   
201
6
 
Raw materials and in-process
  $
17,528
    $
17,986
 
Finished parts
   
48,247
     
43,423
 
Finished products
   
9,192
     
7,640
 
Total net inventories
  $
74,967
    $
69,049