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Note 10 - Subsequent Events (Details Textual) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2024 shares | Jan. 16, 2024 shares | Feb. 29, 2024 shares | Jan. 31, 2024 shares | Dec. 31, 2023 shares | Jun. 30, 2024 shares | Dec. 31, 2022 shares
Common Stock, Shares Authorized (in shares) |  | 150,000,000 |  |  | 600,000,000 | 150,000,000 | 600,000,000
Stock Issued During Period, Shares, Reverse Stock Splits (in shares) |  |  |  | 55,422 |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 15 |  |  | 15 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 150,000,000 |  |  |  |  |
Stock Issued During Period, Shares, Reverse Stock Splits (in shares) | 55,385 |  |  |  |  |  |
Subsequent Event [Member] | Pre-Funded Warrants [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrant Exercise (in shares) |  |  | 133,302 |  |  |  |
Subsequent Event [Member] | Consulting Agreement [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 6,702 |  |  |

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