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Note 3 - Inventories
3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Inventory Disclosure [Text Block]
3
.
Inventories
 
Inventories consist of the following (in thousands):
 
   
March 31,
2018
   
December 31,
2017
 
Short-term inventories:
               
Raw materials
  $
13,135
    $
13,700
 
Work-in-process
   
1,457
     
1,268
 
Finished goods
   
938
     
464
 
Supplies
   
1,596
     
1,623
 
Total short-term inventories
   
17,126
     
17,055
 
                 
Long-term inventories:
               
Finished goods
   
139
     
820
 
Total inventories
  $
17,265
    $
17,875
 
 
Long-term inventories are recorded in Other assets.