Product Warranty Provisions (Schedule Of Accrued Warranty) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Product Warrantie Provisions [Abstract]
Warranty accrual, December 31, 2011	$ 691,832
Warranty expense incurred	449,401
Payments made	(575,801)
Warranty accrual, June 30, 2012	$ 565,432