Product Warranty Provisions (Schedule Of Accrued Warranty) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Product Warrantie Provisions [Abstract]
Warranty accrual, beginning of the fiscal year	$ 691,832	$ 469,837
Warranty expense incurred	650,367	762,872
Payments made	(688,726)	(540,877)
Warranty accrual, end of the fiscal year	$ 653,473	$ 691,832