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Note 5 - Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Inventory as of
 
(in thousands)
 
March 31, 2019
   
December 31, 2018
 
Unprocessed
  $
286,430
    $
306,953
 
Processed and finished
   
56,446
     
61,785
 
Totals
  $
342,876
    $
368,738