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Warranty Reserves (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Warranty Reserves [Abstract]    
Product Warranty Accrual, Current $ 419,000 $ 823,000
Product Warranty Accrual, Noncurrent 100,000 52,000
Product Warranty Accrual $ 519,000 $ 875,000