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Consolidated Statement of Stockholders' Equity (Parentheticals) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Common Stock [Member] |  |
Shares issued, offering cost per share (in dollars per share) | $ 5.00 |
Additional Paid-in Capital [Member] |  |
Shares issued, offering cost | $ 762,875 |
Shares issued, offering cost per share (in dollars per share) |  | $ 7.25
Shares issued, offering cost |  | $ 1,548,161
Prefunded warrants, transferred to equity (in shares) | 515,000 |

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