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Consolidated Statement of Stockholders' Equity (Parentheticals) | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / shares shares
Shares issued, offering cost | $ | $ 762,875
Shares issued, offering cost per share (in dollars per share) | $ / shares | $ 5.00
Prefunded warrants, transferred to equity (in shares) | shares | 515,000

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