Quarterly report pursuant to Section 13 or 15(d)

F. ACCRUED LIABILITIES AND EXPENSES (Details)

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F. ACCRUED LIABILITIES AND EXPENSES (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Accrued liabilities and expenses      
Accrued liabilities and expenses $ 279,023 $ 214,925  
Accrued payroll and payroll taxes 238,156 227,153  
Accrued sales taxes, penalties, and interest 21,309 26,957  
Product warranties 52,528 58,791 $ 46,103
Total accrued liabilities and expenses $ 591,016 $ 527,826