Inventory (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Inventories
Raw materials	$ 11,238,953	$ 11,304,265
Work-in-process	206,711	304,783
Finished goods	3,297,776	4,306,585
Reserve for excess and obsolete inventory	(4,276,582)	(4,430,872)
Inventory, net	$ 10,466,858	$ 11,484,761

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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Reference 4: 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