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Note 2 - Inventories (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule Of Inventory Current And Non Current [Table Text Block]
 
 
March 31, 2017
 
 
December 31, 2016
 
Short-term inventories:
               
Raw materials
  $
13,117
    $
15,411
 
Work-in-process
   
1,209
     
1,235
 
Finished goods
   
323
     
40
 
Supplies
   
2,305
     
2,351
 
Total short-term inventories
   
16,954
     
19,037
 
                 
Long-term inventories:
               
Finished goods
   
729
     
773
 
Total inventories
  $
17,683
    $
19,810