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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
As of December 31,
 
(in thousands)
 
2019
   
2018
 
Unprocessed
  $
220,787
    $
306,953
 
Processed and finished
   
52,744
     
61,785
 
Totals
  $
273,531,
    $
368,738