F. ACCRUED LIABILITIES AND EXPENSES (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Accrued liabilities and expenses
Accrued liabilities and expenses	$ 434,473	$ 214,925
Accrued payroll and payroll taxes	302,973	227,153
Accrued sales taxes, penalties, and interest	17,508	26,957
Product warranties	48,222	58,791	$ 46,103
Total accrued liabilities and expenses	$ 803,176	$ 527,826