Annual report pursuant to Section 13 and 15(d)

8. Stock Options and Warrants (Details-Assumptions)

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8. Stock Options and Warrants (Details-Assumptions) - Options [Member]
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Expected life (years) 5 - 6 years 5.5 years
Risk free interest rate-minimum 1.72% 1.23%
Risk free interest rate-maximum 1.94% 1.72%
Volatility-miminum 114.00% 119.00%
Volatility-maximum 124.00% 121.00%
Expected dividend yield 0.00% 0.00%