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Note 10 - Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

March 31,

  

December 31,

 
  

2022

  

2021

 

Finished goods

 $33,122  $34,899 

Raw materials, equipment spares and consumables

  84,268   76,025 

Work-in-progress

  16,267   14,192 

Total

 $133,657  $125,116