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Note 11 - Common Stock Warrants - Outstanding Warrants (Details) - $ / shares |  | 9 Months Ended
--- | --- | ---
Jul. 26, 2024 | Sep. 30, 2024 | Sep. 30, 2023
Outstanding warrants (in shares) |  | 210,946 |  | 65,886
Outstanding warrants, weighted-average exercise price (in dollars per share) |  | $ 50.96 |  | $ 269.54
Warrants granted (in shares) |  | 10,730,589 |  | 145,056
Warrants granted, weighted average exercise price (in dollars per share) |  | $ 0.69 |  | $ 45.5
Warrants exercised (in shares) |  | 90,381 |  | (0)
Warrants exercised, weighted-average exercise price (in dollars per share) |  | $ 2.5 |  | $ 0
Warrants expired (in shares) |  | (14,879) |  | 0
Warrants expired, weighted average exercise price (in dollars per share) |  | $ 88.87 |  | $ 0
Warrants exercised (in shares) |  | (90,381) |  | 0
Outstanding warrants (in shares) |  | 10,836,275 | [1] | 210,942
Outstanding warrants, weighted-average exercise price (in dollars per share) |  | $ 1.41 |  | $ 76.23
Prefunded Warrants 2024 Public Offering [Member] |  |  |  |
Warrants granted (in shares) | 2,041,814 | 2,041,814 |  |
Warrants granted, weighted average exercise price (in dollars per share) |  | $ 0.01 |  |
Warrants exercised (in shares) |  | 2,041,814 |  |
Warrants exercised, weighted-average exercise price (in dollars per share) |  | $ 0.01 |  |
Warrants exercised (in shares) |  | (2,041,814) |  |
Outstanding warrants, weighted-average exercise price (in dollars per share) | $ 0.01 |  |  |
[1] | After giving retroactive effect to the 1-for-35 Reverse Stock Split that became effective May 30, 2024.

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