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Consolidated Statements of Cash Flows (Parentheticals) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Stock Issued During Period, Shares, Warrants Exercised (in shares) | 36,902 |
Conversion from Notes Payable to Convertible Preferred Stock [Member] |  |
Notes payable cancelled in exchange for convertible preferred stock |  | $ 250,000
Conversion of Preferred Stock into Common Stock [Member] |  |
Preferred stock converted (in shares) | 2,686 | 2,664
Common stock issued (in shares) | 716,790 | 14,819

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