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Inventories (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Inventories [Abstract]    
Finished goods $ 3,027,900 $ 2,462,548
Production supplies 2,690,097 2,599,668
Raw materials 1,181,011 876,970
Total inventories $ 6,899,008 $ 5,939,186