Inventories (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Inventories [Abstract]
Finished goods	$ 3,077,968	$ 3,027,900	$ 2,785,838
Production supplies	3,125,476	2,690,097	3,025,400
Raw materials	1,152,440	1,181,011	1,269,661
Total inventories	$ 7,355,884	$ 6,899,008	$ 7,080,899