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Note 4 - Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30,
2018
   
December 31,
2017
 
Raw materials and in-process
  $
21,531
    $
17,528
 
Finished parts
   
49,211
     
48,247
 
Finished products
   
8,676
     
9,192
 
Total net inventories
  $
79,418
    $
74,967