Annual report pursuant to Section 13 and 15(d)

F. ACCRUED LIABILITIES AND EXPENSES (Details)

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F. ACCRUED LIABILITIES AND EXPENSES (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrued liabilities and expenses      
Accrued liabilities and expenses $ 325,855 $ 294,709  
Accrued payroll and payroll taxes 241,253 230,931  
Accrued sales taxes, penalties, and interest 43,400 83,282  
Product warranties 46,103 59,892 $ 95,540
Total accrued liabilities and expenses $ 656,611 $ 668,814