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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accrued liabilities and expenses      
Accrued payroll and payroll taxes $ 343,426 $ 241,253  
Accrued expenses 330,467 239,793  
Accrued professional 70,924 86,062  
Accrued sales taxes, penalties, and interest 59,185 43,400  
Product warranties 39,736 46,103 $ 59,982
Total accrued liabilities and expenses $ 843,738 $ 656,611