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Note 6 - Stockholders' Equity (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
May 21, 2024 USD ($) $ / shares shares | Jan. 16, 2024 shares | Jun. 30, 2024 USD ($) $ / shares shares | Jan. 31, 2024 shares | Mar. 31, 2024 shares | Jun. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares
Common Stock, Shares Authorized (in shares) |  | 150,000,000 | 150,000,000 |  |  | 150,000,000 |  | 600,000,000 | 600,000,000
Proceeds from Warrant Exercises | $ |  |  |  |  |  | $ 1,389,363 | $ 0 | $ 4,062,442 | $ 7,626,134
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  |  | 6,703 |  |  |  | 24,021 | 9,567
Stock Issued During Period, Shares, Reverse Stock Splits (in shares) |  |  |  | 55,422 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  |  |  |  |  |  |  | 134,609 | 137,276
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  |  |  |  |  |  |  | $ 28.41 | $ 28.35
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  | 8 years 2 months 12 days | 9 years 2 months 12 days
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  |  | 2,438,423 |
Stock Incentive Plan 2020 [Member] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period |  |  |  |  |  | 961 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number |  |  | 133,648 |  |  | 133,648 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  |  | $ 28.39 |  |  | $ 28.39 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  | 7 years 8 months 12 days |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 333,648 |  |  | 333,648 |  | 334,609 |
May 2024 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 582,844 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Exercise (in shares) |  |  | 582,844 |  |  |  |  |  |
May 2024 Common Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 1.68 |  |  |  |  |  |  |  |
May 2024 Common Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 1,605,688 |  |  |  |  |  |  |  |
December 2023 Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Exercise (in shares) |  |  | 238,000 |  | 269,032 |  |  |  |
Warrants Issued in June 2020 [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Cashless Exercise (in shares) |  |  | 2,549 |  |  |  |  |  |
Class of Warrant or Right, Warrants Exercised (in shares) |  |  | 4,000 |  |  |  |  |  |
Warrants Issued in December 2023 [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Exercise (in shares) |  |  | 826,998 |  |  |  |  |  |
Proceeds from Warrant Exercises | $ |  |  | $ 1,400,000 |  |  |  |  |  |
Registered Direct Offering [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 220,000 |  |  |  |  |  |  |  |
May 2024 Offering [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ | $ 1,200,000 |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 15 |  |  |  |  |  | 15 |

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