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Inventory - Summary of inventory (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 7,576,862	$ 9,159,004
Work-in-process	314,321	462,832
Finished goods	659,274	732,871
Total inventory	$ 8,550,457	$ 10,354,707

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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