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Note 2 - Inventories
 6 Months Ended
Jun. 30, 2017
Notes to Financial Statements  
Inventory Disclosure [Text Block]
2.
Inventories
 
Inventories consist of the following (in thousands):
 
   
June 30,
2017
    
December 31,
2016
  
Short-term inventories:
                
Raw materials
   $
18,264
     $
15,411
  
Work-in-process
    
1,661
      
1,235
  
Finished goods
    
194
      
40
  
Supplies
    
2,296
      
2,351
  
Total short-term inventories
    
22,415
      
19,037
  
                 
Long-term inventories:
                
Finished goods
    
729
      
773
  
Total inventories
   $
23,144
     $
19,810
  
 
Long-term inventories are recorded in
Other assets. As of
December 
31,
2016,
inventories were stated at the lower of cost or market. Upon adoption of Accounting Standards Update (“ASU”)
No.
 
2015
-
11,
“Inventory (Topic 
330
): Simplifying the Measurement of Inventory” on
January 
1,
2017,
which did
not
result in a change in the Company’s inventory values, inventories are stated at the lower of cost and net realizable value. See further discussion of this ASU in Note 
11,
“Recent Accounting and Reporting Developments.”