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Note 5 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 2 Months Ended | 6 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 02, 2023 | May 27, 2022 | Jan. 19, 2022 | Jan. 31, 2024 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 02, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 29, 2020
Proceeds from Warrant Exercises |  |  |  |  |  |  | $ 1,389,363 | $ 0 |  | $ 4,062,442 | $ 7,626,134 |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  | 2,362,937 |  |  | 2,103,813 |  |
Stock Issued During Period, Shares, Issued for Services (in shares) |  |  |  | 6,703 |  |  |  |  |  | 24,021 | 9,567 |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  |  |  |  | 2,438,423 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent |  |  |  |  |  |  |  |  |  | 110.00% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period |  |  |  |  |  |  |  |  |  | 10 years |  |
Stock Incentive Plan 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  | 333,648 |  |  | 334,609 |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 738,080 | 157,333 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised |  | 132,020 |  |  |  | 606,060 |  |  |  |  |  |
Common Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 204,499 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 48.9 |  |  |  |  |  |  |  |  |
Preferred Investment Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 808,081 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 24.75 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised |  |  |  |  | 308,081 |  |  |  |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  | $ 7,626,000 |  |  |  |  |  |  |
January 2022 and May 2022 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 704,499 |  |  |  |  |  |  |  | 704,499 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 6.21 |  |  |  |  |  |  |  | $ 6.21 | $ 6.21 |  |
Class of Warrant or Right, Outstanding | 1,408,998 |  |  |  |  |  |  |  | 1,408,998 | 1,408,998 |  |
Stock Issued During Period, Shares, Warrant Exercise (in shares) |  |  |  |  |  |  |  |  | 197,467 |  |  |
December 2023 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 6.21 |  |  |  |  |  |  |  | $ 6.21 | $ (0) |  |
Class of Warrant or Right, Outstanding | 507,032 |  |  |  |  |  |  |  | 507,032 | 507,032 |  |
December 2023 Warrant Exercise Inducement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |
Unit Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 6.21 |  | $ 24.75
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 70,000 | 47,166 |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 18,500,000 | $ 9,200,000 |  |  |  |  |  |  |  |  |

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