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Note 4 - Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
 
 
June
3
0
, 2019
   
December 31, 2018
 
Inventories, net:            
Raw materials and in-process
  $
17,985
    $
21,773
 
Finished parts
   
50,584
     
54,209
 
Finished products
   
10,240
     
11,405
 
Total net inventories
  $
78,809
    $
87,387