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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]

Inventories, net:

 

September 30, 2020

  

December 31, 2019

 

Raw materials and in-process

 $18,377  $16,474 

Finished parts

  51,411   47,317 

Finished products

  12,716   12,206 

Total net inventories

 $82,504  $75,997