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Inventories (Details) - USD ($)
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 2,373,476 $ 3,027,900
Production supplies 2,069,742 2,690,097
Raw materials 1,371,001 1,181,011
Total inventories $ 5,814,219 $ 6,899,008