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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Parentheticals) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Share issuance costs | $ 7,778 | $ 16,900 | $ 16,900 |
Series F put option liability |  |  |  | $ 103,364
Series F Preferred Stock |  |  |  |
Share issuance costs |  |  |  | 118,855
Conversion of preferred stock price per share |  | $ 0.10 | $ 0.10 |
Series D Preferred Stock |  |  |  |
Share issuance costs |  |  |  | $ 183,343
Conversion of preferred stock price per share |  | 0.10 | 0.10 | $ 0.25
Redeemable Convertible Series B Preferred Stock |  |  |  |
Conversion of preferred stock price per share |  | 0.10 | 0.10 | 0.25
Conversion liability into common stock per share |  | $ 0.001 | $ 0.001 | 0.15
Series C Preferred Stock |  |  |  |
Conversion of preferred stock price per share |  |  |  | $ 0.25

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