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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
As of December 31,
 
 
(in thousands)
 
2016
 
 
2015
 
Unprocessed
  $
203,256
    $
163,942
 
Processed and finished
   
51,270
     
42,703
 
Totals
  $
254,526
    $
206,645