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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories, net:
 
March 31,
2019
   
December 31,
2018
 
Raw materials and in-process
 
  $
21,242
    $
21,773
 
Finished parts
 
   
52,809
     
54,209
 
Finished products
 
   
11,308
     
11,405
 
Total net inventories
 
  $
85,359
    $
87,387