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, 2017
Dec. 31, 2016
Dec. 31, 2015
Accrued liabilities and expenses      
Accrued liabilities and expenses $ 294,709 $ 223,011  
Accrued payroll and payroll taxes 230,931 331,908  
Accrued sales taxes, penalties, and interest 83,282 274,869  
Accrued interest 0 253  
Product warranties 59,892 95,540 $ 66,555
Total accrued liabilities and expenses $ 668,814 $ 925,581