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Other current liabilities at September 30, 2021 and December 31, 2020 consisted of (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued payroll and payroll taxes $ 3,213,000 $ 1,412,000
Warranty liability 90,000 91,000
Deferred tax liability 18,000
Other accrued expenses $ 305,000 $ 269,000