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Accounting for Guarantees (Details Textual) (USD $)
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6 Months Ended | |||||
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Jun. 30, 2012
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Dec. 31, 2011
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Jun. 30, 2012
Warranty on Products for Labor [Member]
Minimum [Member]
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Jun. 30, 2012
Warranty on Products for Labor [Member]
Maximum [Member]
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Jun. 30, 2012
Warranty for Products for Parts [Member]
Minimum [Member]
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Jun. 30, 2012
Warranty for Products for Parts [Member]
Maximum [Member]
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| Guarantor Obligations (Textual) [Abstract] | ||||||
| Product warranty period | 1 year | 3 years | 1 year | 10 years | ||
| Accounting for Guarantees (Additional Textual) [Abstract] | ||||||
| Maximum contingent liability | $ 2,639,000 | |||||
| Reserve for estimated losses | 165,000 | 203,000 | ||||
| Net liability for guarantees | $ 18,000 | $ 27,000 | ||||