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Warranty Reserves (Details) (USD $)	3 Months Ended		6 Months Ended
Warranty Reserves (Details) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in accrued warranty expense
Beginning balance	$ 107,589	$ 142,396	$ 115,566	$ 135,708
Additions	12,149	22,195	31,721	49,958
Usage	(13,035)	(24,284)	(40,584)	(45,359)
Ending balance	$ 106,703	$ 140,307	$ 106,703	$ 140,307

- 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