Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

12. Earnings/(loss) per share (Details - Dilutive securities)

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12. Earnings/(loss) per share (Details - Dilutive securities) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earningsloss Per Share      
Warrants to purchase common stock 6,733,292 6,733,292 7,241,054
Common stock in the unit purchase option for underwriters 0 0 215,000
Options in the unit purchase option for underwriters to purchase common stock 0 0 215,000
Convertible promissory notes issued to underwriters and other related parties subject to possible conversion 99,243 99,243 113,385
Convertible promissory notes issued to shareholders subject to possible conversion 2,833,344 1,744,603 1,392,602
Options to purchase common stock 473,944 374,650 107,813
Total potential dilutive securities 10,139,823 8,951,788 9,284,854