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Note 5 - Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Inventory as of
 
 
 
(in thousands)
 
September 30, 2018
   
December 31, 2017
 
Unprocessed
  $
306,147
    $
225,187
 
Processed and finished
   
60,051
     
50,120
 
Totals
  $
366,198
    $
275,307