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Note 5 - Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
As of December 31,
 
(in thousands)  
2018
   
2017
 
Unprocessed
  $
306,953
    $
225,187
 
Processed and finished
   
61,785
     
50,120
 
Totals
  $
368,738
    $
275,307