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Product Warranties (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Product Warranties    
Warranty liability, beginning of year $ 257,000 $ 257,000
Accruals 10,000  
Payments   (1,000)
Adjustments and other (171,000) 1,000
Warranty liability, end of year $ 96,000 $ 257,000