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Inventories (Details) - USD ($)
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 1,808,030 $ 2,373,476
Production supplies 2,891,156 2,069,742
Raw materials 1,628,159 1,371,001
Total inventories $ 6,327,345 $ 5,814,219