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Note 2 - Inventory (Details) - Carrying Values of Inventory (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
At average cost (approximates current cost)    
Finished goods $ 25,111 $ 13,590
Work in process 1,906 1,569
Raw materials and supplies 50,343 36,292
77,360 51,451
LIFO reserve (10,019) (9,287)
Total inventory $ 67,341 $ 42,164