Accrued Warranty Costs (Details Textual)	9 Months Ended
	Sep. 30, 2012
Accrued Warranty Costs (Textual) [Abstract]
Commercial and industrial product base warranty coverage for manufactured product	Eighteen months from the date of shipment or twelve months from the date of start up, whichever is shorter
Commercial and industrial product base warranty coverage for spare parts	90 days
Residential products, the base warranty coverage from the date of shipment for material	10 years
Residential products warranty coverage for labor associated with repair	5 years