Annual report pursuant to Section 13 and 15(d)

F. ACCRUED LIABILITIES AND EXPENSES (Tables)

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F. ACCRUED LIABILITIES AND EXPENSES (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of accrued liabilities and expenses
    2018     2017  
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  
Total accrued liabilities and expenses   $ 656,611     $ 668,814