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Note 4 - Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
Inventory as of
 
(in thousands)  
March 31, 2018
   
December 31, 2017
 
Unprocessed
  $
264,837
    $
225,187
 
Processed and finished
   
54,187
     
50,120
 
Totals
  $
319,024
    $
275,307