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Note 10 - Common Stock Warrants - Outstanding Warrants (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Outstanding warrants (in shares) | 10,836,275 | 210,946 | 210,946
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ 1.41 | $ 50.96 | $ 50.96
Warrants granted (in shares) | 0 | 28,572 |
Warrants granted, weighted average exercise price (in dollars per share) | $ 0 | $ 4.9 |
Warrants exercised (in shares) | (1,119,908) | (0) |
Warrants exercised, weighted-average exercise price (in dollars per share) | $ 0.76 | $ 0 |
Warrants expired (in shares) | (5,184,427) | 0 |
Warrants expired, weighted average exercise price (in dollars per share) | $ 0.66 | $ 0 |
Outstanding warrants (in shares) | 101,191 | 239,518 | 10,836,275
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ 66.61 | $ 56.63 | $ 1.41
Warrants surrendered and cancelled (in shares) | (1,988,283) |  |
Warrants surrendered and cancelled, weighted-average exercise price (in dollars per share) | $ 1.27 |  |
Warrants repurchased (in shares) | (2,442,466) |  |
Warrants repurchased, weighted-average exercise price (in dollars per share) | $ 0.66 |  |

X
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X
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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