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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
As of December 31,
 
 
 
 
(in thousands)
 
2017
   
2016
 
Unprocessed
  $
225,187
    $
203,256
 
Processed and finished
   
50,120
     
51,270
 
Totals
  $
275,307
    $
254,526