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Note 5 - Capital Stock - Summary of Warrants Activity (Details) - $ / shares | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Jun. 06, 2025 | Jun. 05, 2025 | Jun. 04, 2025 | Aug. 23, 2024
Common Warrants and 2023 Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 1,359,519 | 1,359,519 | 1,359,519 | 1,359,519 |  |  |  |  |
Exercise Price (in dollars per share) | $ 3.41 | $ 3.41 | $ 3.41 | $ 3.41 |  |  |  |  |
Warrants outstanding and exercisable (in shares) | 1,359,519 | 1,359,519 | 1,359,519 | 1,359,519 |  |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 3.41 | $ 3.41 | $ 3.41 | $ 3.41 |  |  |  |  |
Common Warrants Issued on June 30, 2024 [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 390,959 | 390,959 | 390,959 | 390,959 |  |  |  |  |
Exercise Price (in dollars per share) | $ 3.41 | $ 3.41 | $ 3.41 | $ 3.41 |  |  |  |  |
Warrants outstanding and exercisable (in shares) | 390,959 | 390,959 | 390,959 | 390,959 |  |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 3.41 | $ 3.41 | $ 3.41 | $ 3.41 |  |  |  |  |
Common Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 2,808,728 | 2,808,728 | 2,808,728 | 2,808,728 | 2,272,203 |  |  |  | 2,401,047
Exercise Price (in dollars per share) | $ 3.56 | $ 3.56 | $ 3.56 | $ 3.56 | $ 3.41 |  |  |  |
Warrants outstanding and exercisable (in shares) |  |  |  | 2,272,203 | 103,453 |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) |  |  |  | $ 3.41 | $ 69.03 |  |  |  |
Granted, warrants (in shares) |  |  |  | 2,341,381 | 24,104 |  |  |  |
Granted, warrants, exercise price (in dollars per share) |  |  |  | $ 3.79 | $ 68.4 |  |  |  |
Make Whole Provision, warrants (in shares) |  |  |  |  | 2,426,986 |  |  |  |
Make Whole Provision, weighted average exercise price (in dollars per share) |  |  |  |  | $ 3.41 |  |  |  |
Exercised, warrants (in shares) |  |  |  | (1,804,856) | (282,314) |  |  |  |
Exercised, warrants, exercise price (in dollars per share) |  |  |  | $ 3.67 | $ 3.41 |  |  |  |
Expired, warrants (in shares) |  |  |  |  | (26) |  |  |  |
Expired, warrants, exercise price (in dollars per share) |  |  |  |  | $ 2,575.38 |  |  |  |
Warrants outstanding and exercisable (in shares) | 2,808,728 | 2,808,728 | 2,808,728 | 2,808,728 | 2,272,203 |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 3.56 | $ 3.56 | $ 3.56 | $ 3.56 | $ 3.41 |  |  |  |
Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 706,261 | 706,261 | 706,261 | 706,261 |  |  |  |  |
Exercise Price (in dollars per share) | $ 3.77 | $ 3.77 | $ 3.77 | $ 3.77 |  | $ 3.77 |  |  |
Exercised, warrants (in shares) | (1,283,131) |  |  | (1,283,131) |  |  |  |  |
Warrants outstanding and exercisable (in shares) | 706,261 | 706,261 | 706,261 | 706,261 |  |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 3.77 | $ 3.77 | $ 3.77 | $ 3.77 |  |  |  |  |
Advisor Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 100,000 | 100,000 | 100,000 | 100,000 |  |  |  |  |
Exercise Price (in dollars per share) | $ 3.77 | $ 3.77 | $ 3.77 | $ 3.77 |  |  | $ 3.77 |  |
Exercised, warrants (in shares) |  |  | 0 |  |  |  |  |  |
Warrants outstanding and exercisable (in shares) | 100,000 | 100,000 | 100,000 | 100,000 |  |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 3.77 | $ 3.77 | $ 3.77 | $ 3.77 |  |  |  |  |
The 2025 Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 99,470 | 99,470 | 99,470 | 99,470 |  |  |  |  |
Exercise Price (in dollars per share) | $ 4.71 | $ 4.71 | $ 4.71 | $ 4.71 |  |  |  | $ 4.7125 |
Exercised, warrants (in shares) |  | 0 |  |  |  |  |  |  |
Warrants outstanding and exercisable (in shares) | 99,470 | 99,470 | 99,470 | 99,470 |  |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 4.71 | $ 4.71 | $ 4.71 | $ 4.71 |  |  |  |  |
Q3 2025 Common Warrants [Member] |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 152,519 | 152,519 | 152,519 | 152,519 |  |  |  |  |
Exercise Price (in dollars per share) | $ 3.41 | $ 3.41 | $ 3.41 | $ 3.41 |  |  |  |  |
Warrants outstanding and exercisable (in shares) | 152,519 | 152,519 | 152,519 | 152,519 |  |  |  |  |
Warrants outstanding and exercisable, exercise price (in dollars per share) | $ 3.41 | $ 3.41 | $ 3.41 | $ 3.41 |  |  |  |  |

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