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Other current liabilities at June 30, 2021 and December 31, 2020 consisted of (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accrued payroll and payroll taxes $ 4,341,000 $ 1,412,000
Warranty liability 91,000 91,000
Other accrued expenses 565,000 269,000
  $ 5,572,000 $ 1,790,000