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Inventory - Summary of inventory (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 7,484,596	$ 7,576,862
Work-in-process	210,644	314,321
Finished goods	900,066	659,274
Total inventory	$ 8,595,306	$ 8,550,457

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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