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Note 2 - Inventory (Details) - Carrying Values of Inventory (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
At average cost (approximates current cost)    
Finished goods $ 20,601 $ 13,590
Work in process 2,265 1,569
Raw materials and supplies 29,137 36,292
52,003 51,451
LIFO reserve (9,520) (9,287)
Total inventory $ 42,483 $ 42,164