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Accrued Warranty Costs (Details Textual) | 12 Months Ended
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Dec. 31, 2011
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

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