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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March
3
1
,
201
8
   
December 31,
201
7
 
Raw materials and in-process
  $
19,798
    $
17,528
 
Finished parts
   
50,927
     
48,247
 
Finished products
   
8,407
     
9,192
 
Total net inventories
  $
79,132
    $
74,967