Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of the summary of the product warranty activity recorded during the period

	June 30, 2012		June 30, 2011
Beginning balance - January 1	$	1,210,919	$	862,480
Additions for current year deliveries	346,970		445,570
Reductions for payments made	(537,879)		(336,950)
Ending balance - June 30	$	1,020,010	$	971,100