Annual report pursuant to Section 13 and 15(d)

F. CURRENT ACCRUED LIABILITIES (Details)

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F. CURRENT ACCRUED LIABILITIES (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accrued liabilities and expenses      
Accrued payroll and payroll taxes $ 252,595 $ 227,153  
Accrued sales taxes, penalties, and interest 31,396 26,957  
Product warranties 45,328 58,791 $ 46,103
Other accrued liabilities 233,993 214,925  
Total current accrued liabilities $ 563,312 $ 527,826