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Note 10 - Common Stock Warrants and Warrant Liabilities - Schedule of Stockholders' Equity Note, Warrants or Rights (Details) - $ / shares shares in Thousands | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2026 | Jan. 16, 2026 | Oct. 31, 2025 | Oct. 16, 2025 | Oct. 15, 2025 | Nov. 01, 2022
Outstanding warrants (in shares) | 1,098,239 |  |  |  |  |
Pre-Funded Warrants granted (in shares) | 167,539,227 |  |  |  |  |
Warrants exercised (in shares) | (9,852) |  |  |  |  |
Warrants expired (in shares) | (787) |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 4 |  |  |  |  |
Outstanding warrants (in shares) | 168,626,831 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 0.06 |  |  |  |  |
The July 2020 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 784 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | (784) |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 0 |  |  |  |  |
TLF Bio Innovation Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 3 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | (3) |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 0 |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 2,832 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 3 |  |  |  |  |
Outstanding warrants (in shares) | 2,835 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 557.65 |  |  |  |  |
Expiration Date | Sep. 11, 2028 |  |  |  |  |
September 2022 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 332 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 1 |  |  |  |  |
Outstanding warrants (in shares) | 333 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 1,102.5 |  |  |  |  |
Expiration Date | Sep. 11, 2028 |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 454 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 454 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 1,102.5 |  |  |  |  | $ 1,102.5
Expiration Date | Nov. 20, 2028 |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 5,341 |  |  |  |  |
Warrants exercised (in shares) | (5,341) |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 0 |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 4,511 |  |  |  |  |
Warrants exercised (in shares) | (4,511) |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 0 |  |  |  |  |
The July 2024 Series F-1 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 2,900 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 2,900 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 3.3 |  |  |  |  |
Expiration Date | Jul. 30, 2029 |  |  |  |  |
October 2025 Pre-Funded Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 1,081,082 |  |  |  |  |
Pre-Funded Warrants granted (in shares) | 0 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 1,081,082 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 0.002385 |  | $ 0.002385 | $ 5.5 | $ 0.05 |
The January 2026 Warrants [Member] |  |  |  |  |  |
Outstanding warrants (in shares) | 0 |  |  |  |  |
Pre-Funded Warrants granted (in shares) | 167,539,227 |  |  |  |  |
Warrants exercised (in shares) | 0 |  |  |  |  |
Warrants expired (in shares) | 0 |  |  |  |  |
Warrants issued for 5:1 reverse stock split due to rounding feature (in shares) | 0 |  |  |  |  |
Outstanding warrants (in shares) | 167,539,227 |  |  |  |  |
Weighted Average Price per share at March 31, 2026 (in dollars per share) | $ 0.05 | $ 0.05 |  |  |  |

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