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Product Warranties (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Product Warranty Liability [Line Items]    
Warranty liability, beginning of year $ 181,000 $ 213,000
Accruals 51,000 69,000
Payments (32,000) (114,000)
Adjustments and other 57,000 13,000
Warranty liability, end of year $ 257,000 $ 181,000