Inventories (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Components of inventories
Raw materials	$ 1,491,999	$ 1,685,493
Work in process	2,973,169	2,602,990
Finished goods	2,325,540	1,745,052
Inventory gross	6,790,708	6,033,535
Less: reserve for obsolete inventory	(136,727)	(135,980)
Inventory net	$ 6,653,981	$ 5,897,555

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.

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

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-Name Accounting Research Bulletin (ARB)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details