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Inventories (Details) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Inventory Disclosure [Abstract]      
Finished goods $ 3,005,972 $ 3,027,900 $ 2,977,298
Production supplies 2,323,139 2,690,097 3,321,484
Raw materials 1,481,430 1,181,011 1,508,368
Total inventories $ 6,810,541 $ 6,899,008 $ 7,807,150