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Accrued Expenses (Details Narrative) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accrued Expenses        
Product warranty expense $ 8,000 $ 10,000 $ 15,000 $ 18,000