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Note 5 - Stockholders' Equity - Warrant Activity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Warrants outstanding, number of shares (in shares) | 405,624 |
Warrants outstanding, weighted average exercise price (in dollars per share) | $ 11 |
Warrants outstanding, weighted average remaining contractual life (Year) | 3 years 2 months 26 days | 3 years 5 months 26 days
Warrants exercised, number of shares (in shares) | (18,661) |
Warrants exercised, exercise price (in dollars per share) | $ 11 |
Redeemed/Cancelled, number of shares (in shares) | 0 |
Redeemed/Cancelled, exercise price (in dollars per share) |  |
Warrants outstanding, number of shares (in shares) | 386,963 | 405,624
Warrants outstanding, weighted average exercise price (in dollars per share) | $ 11 | $ 11

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