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Product Warranties (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Product Warranties    
Warranty liability, beginning of year $ 257,000 $ 181,000
Accruals   51,000
Payments (1,000) (32,000)
Adjustments and other 1,000 57,000
Warranty liability, end of year $ 257,000 $ 257,000