Quarterly report pursuant to Section 13 or 15(d)

E. ACCRUED LIABILITIES AND EXPENSES (Details)

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E. ACCRUED LIABILITIES AND EXPENSES (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accrued liabilities and expenses      
Accrued liabilities and expenses $ 186,965 $ 294,709  
Accrued payroll and payroll taxes 314,830 230,931  
Accrued sales taxes, penalties, and interest 44,149 83,282  
Product warranties 55,316 59,892 $ 95,540
Total accrued liabilities and expenses $ 601,260 $ 668,814