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Note 11 - Stockholders' Equity and Common Stock Warrants (Details Textual) - USD ($) |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 16, 2023 | Jul. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022
Class of Warrant or Right, Outstanding |  |  | 598,457 |
Stock Issued During Period, Shares, Acquisitions |  |  | 1,360,244 |
Stock Issued During Period, Shares, New Issues |  | 63,422 |  |
Shares Issued, Price Per Share |  | $ 12.78 |  |
Proceeds from Issuance of Common Stock |  | $ 800,000 | $ 810,000 | $ 0
Pre-funded Warrants [Member] |  |  |  |
Class of Warrant or Right, Outstanding | 394,628 |  |  |
Conversion of Preferred Stock into Common Stock [Member] |  |  |  |
Conversion of Stock, Shares Converted |  |  | 3,331,201 |
Conversion of Stock, Shares Issued |  |  | 2,936,566 |
Conversion of Debt into Common Stock [Member] |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued | 795,905 |  | 795,905 |
Debt Conversion, Converted Instrument, Warrants or Options Issued | 101,367 |  | 101,367 |

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