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Note 5 - Stockholders' Equity - 10Q (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 25, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2025
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 8,651,395 |
Stock Incentive Plan 2020 [Member] |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 2,033,648 | 2,033,648
March 2025 Pre-funded Warrants [Member] |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 2,085,115 |  |  |
March 2025 Common Warrants [Member] |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.31 |  |  |
March 2025 Common Warrants [Member] | Maximum [Member] |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,435,115 |  |  |
Registered Direct Offering [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 1,350,000 |  |  |
March 2025 Offering [Member[ |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 4.1 |  |  |
At-the-Market Program [Member] |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,952,603 | 2,012,167 |
Proceeds from Issuance of Common Stock |  | $ 3.8 | $ 4.9 |

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