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Note 3 - Inventories
6 Months Ended
Jun. 30, 2015
Notes to Financial Statements  
Inventory Disclosure [Text Block]
3.     Inventories
 
Inventories are stated at the lower of cost or market and consist of the following (in thousands):
 
 
 
 
June 30,
2015
 
 
December 31,
2014
 
Short-term inventories:                
Raw materials
  $ 36,941     $ 48,005  
Work-in-process
    1,618       1,741  
Finished goods
    10,244       20,663  
Supplies
    2,348       2,370  
Total short-term inventories
    51,151       72,779  
                 
Long-term inventories:
               
Finished goods
    912       1,214  
Total inventories
  $ 52,063     $ 73,993  
 
Long-term inventories are recorded in other assets.