Inventories by major categories (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 6,162,314	$ 1,574,759
Finished goods	2,241,276	1,502,197
Inventories, gross	8,403,590	3,076,956
Less: Allowance for obsolete inventories	(394,119)	(6,956)
Inventories, net	$ 8,009,471	$ 3,070,000

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details