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Note 11 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Jul. 23, 2024 | Jul. 12, 2024 | May 21, 2024
--- | --- | --- | ---
Registered Direct Offering [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 220,000
Subsequent Event [Member] | July 2024 Pre-funded Warrants [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 626,368 |
Stock Issued During Period, Shares, Warrant Exercise (in shares) | 626,368 |  |
Subsequent Event [Member] | July 2024 Common Warrants [Member] |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 2.86 |
Subsequent Event [Member] | July 2024 Common Warrants [Member] | Maximum [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 2,170,000 |
Subsequent Event [Member] | Registered Direct Offering [Member] |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 458,632 |
Subsequent Event [Member] | July 2024 Offering [Member] |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 2.8 |

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