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Note 4 - Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]

Inventories, net:

 

September 30,

2021

  

December 31,

2020

 

Raw materials and in-process

 $21,362  $18,152 

Finished parts

  49,522   51,701 

Finished products

  10,529   12,833 

Total net inventories

 $81,413  $82,686