Product Warranty Provisions (Schedule Of Accrued Warranty) (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Product Warranty Provisions [Abstract]
Warranty accrual, beginning of the fiscal period	$ 653,473	$ 691,832
Warranty expense incurred	90,964	650,367
Payments made	(198,358)	(688,726)
Warranty accrual, end of the fiscal period	$ 546,079	$ 653,473