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Warranty Reserves (Details) (USD $)	3 Months Ended
Warranty Reserves (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Changes in accrued warranty expense
Beginning balance	$ 115,566	$ 135,708
Additions	19,572	27,763
Usage	(27,549)	(21,075)
Ending balance	$ 107,589	$ 142,396

- 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