Product Warranty Provisions (Tables)

6 Months Ended

Jun. 30, 2012

Product Warranty Provisions [Abstract]

Schedule Of Accrued Warranty

	June 30,
	2012
Warranty accrual, December 31, 2011	$691,832
Warranty expense incurred	256,866
Payments made	(355,275)
Warranty accrual, June 30, 2012	$593,423