Inventories (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Inventories [Abstract]
Finished goods	$ 2,785,838	$ 2,462,548	$ 2,091,004
Production supplies	3,025,400	2,599,668	2,082,194
Raw materials	1,269,661	876,970	1,032,259
Total inventories	$ 7,080,899	$ 5,939,186	$ 5,205,457

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Amount before last-in first-out (LIFO) and valuation reserves of merchandise or goods held by the entity that are readily available for sale.

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Carrying amount (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).

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Gross amount of unprocessed items to be consumed in the manufacturing or production process. Also includes purchased parts that will be used as components of a finished product.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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