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Warranty Reserves (Details) (USD $)	3 Months Ended		9 Months Ended
Warranty Reserves (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Changes in accrued warranty expense
Beginning balance	$ 140,307	$ 172,583	$ 135,708	$ 155,918
Additions	21,939	62,241	71,897	196,354
Usage	(4,331)	(62,056)	(49,690)	(179,504)
Ending balance	$ 157,915	$ 172,768	$ 157,915	$ 172,768

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References+ Details