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Consolidated Statement of Stockholders' Equity (Parentheticals) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Common Stock [Member] | Issuance 1 [Member] |  |
Shares issued, offering cost per share (in dollars per share) | $ 4.63 | $ 4.04
Common Stock [Member] | Convertible Preferred Stock [Member] |  |
Convertible Preferred shares, convertible securities (in shares) |  | 4
Common Stock [Member] |  |
Shares issued, offering cost per share (in dollars per share) | $ 7.25 | $ 1.36
Additional Paid-in Capital [Member] |  |
Shares issued, offering cost | $ 1,548,161 | $ 747,423

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