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Note 10 - Subsequent Events - 10Q (Details Textual) - USD ($) |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 02, 2025 | Jul. 28, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Proceeds from Warrant Exercises |  |  | $ 209 | $ 1,389,363 | $ 2,367,133 | $ 4,062,442
Subsequent Event [Member] |  |  |  |  |  |
Units Issued During Period, Units, New Issues (in shares) | 9,235,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 9,235,000 |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 18,470,000 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 0.65 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.65 |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 5 years |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 5,600,000 |  |  |  |  |
Proceeds from Warrant Exercises |  | $ 130,000 |  |  |  |
Subsequent Event [Member] | Pre-Funded Warrants [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  | 200,000 |  |  |  |

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