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Note 5 - Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Inventory as of
 
(in thousands)
 
June 30, 2018
   
December 31, 2017
 
Unprocessed
  $
300,237
    $
225,187
 
Processed and finished
   
63,358
     
50,120
 
Totals
  $
363,595
    $
275,307