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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

As of December 31,

 

(in thousands)

 

2020

  

2019

 

Unprocessed

 $194,614  $220,787 

Processed and finished

  45,387   52,744 

Total

 $240,001  $273,531