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Inventories (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Finished goods $ 1,966,744 $ 2,373,476
Production supplies 2,754,577 2,069,742
Raw materials 2,210,452 1,371,001
Total inventories $ 6,931,773 $ 5,814,219