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Note 11 - Common Stock Warrants - Warrants Outstanding (Details) - $ / shares shares in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Dec. 31, 2022 | Nov. 10, 2022 | Nov. 30, 2021 | Jul. 31, 2020
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Exercise price (in dollars per share) | $ 37.4 |  | $ 50.96 | $ 76.23 |  | $ 269.54 |  |  |
Warrants outstanding (in shares) | 224,777 |  | 210,946 | 210,942 |  | 65,886 |  |  |
The 2019 Ladenburg Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 1,212.75 |  |  |  |  |  |  |  |
Expiration date | Aug. 08, 2024 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 138 |  |  |  |  |  |  |  |
The July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 2,021.25 |  |  |  |  |  |  |  | $ 2,021.25
Expiration date | Jan. 22, 2026 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 1,714 |  |  |  |  |  |  |  |
The Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 52.5 |  |  |  |  |  |  |  |
Expiration date | Jan. 22, 2026 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 2,206 |  |  |  |  |  |  |  |
TLF Bio Innovation 2021 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 822.96 |  |  |  |  |  |  |  |
Expiration date | Jan. 15, 2026 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 13 |  |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 220.5 |  |  |  |  |  |  | $ 649.25 |
Expiration date | Sep. 11, 2028 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 7,654 |  |  |  |  |  |  |  |
The Amended November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 52.5 |  |  |  |  |  |  |  |
Expiration date | Sep. 11, 2028 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 15,308 |  |  |  |  |  |  |  |
The September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 220.5 |  |  |  |  |  |  |  |
Expiration date | Sep. 11, 2028 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 2,552 |  |  |  |  |  |  |  |
The Amended September 2022 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 52.5 |  |  |  |  |  |  |  |
Expiration date | Sep. 11, 2028 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 1,715 |  |  |  |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 220.5 |  |  |  | $ 52.5 |  | $ 220.5 |  |
Expiration date | Nov. 20, 2028 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 2,268 |  |  |  |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 8.75 |  | $ 8.75 |  |  |  |  |  |
Expiration date | Jun. 21, 2029 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 72,256 |  |  |  |  |  |  |  |
March 2024 Warrant [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.9 | $ 4.9 |  |  |  |  |  |  |
Expiration date | Mar. 24, 2029 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 28,572 |  |  |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 2.57 |  |  |  |  |  |  |  |
Expiration date | Dec. 17, 2029 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 90,381 |  |  |  |  |  |  |  |

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