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Note 2 - Inventories (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule Of Inventory Current And Non Current [Table Text Block]
 
 
June 30,
2016
 
 
December 31,
2015
 
Short-term inventories:
               
Raw materials
  $ 21,302     $ 21,486  
Work-in-process
    1,213       1,901  
Finished goods
    631       3,641  
Supplies
    2,396       2,447  
Total short-term inventories
    25,542       29,475  
                 
Long-term inventories:
               
Finished goods
    789       823  
Total inventories
  $ 26,331     $ 30,298