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Note 11 - Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 21, 2023 | May 01, 2023 | Sep. 09, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 24, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 10, 2022 | Nov. 30, 2021 | Sep. 09, 2020 | Jul. 31, 2020
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 1.6 | $ 7.7 |  | $ 1.82 | $ 7.7 |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | (0) | 0 |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | $ (194) | $ (0) |  |  |  |  |  |  |
March 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 0.14 |  | $ 0.14 |  |  |  |  |  |
Warrants and Rights, Vesting Period (Month) |  |  |  | 6 months |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 2,528,848 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 0.25 |  |  |  |  |  |  |  |
The May 2023 B-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 2,538,464 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.3 | $ 1.3 |  | 1.3 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | 634,616 |  |  |  |  |  |  |  |  |  |  |
The May 2023 B-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 2,538,464 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.3 |  | 1.3 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | 1,894,232 |  |  |  |  |  |  |  |  |  |  |
The 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  | 2,528,848 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.25 |  |  |  |  |  | $ 0.25 |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  | 2,528,848 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 1.3 |  |  |  |  |
Fair Value Adjustment of Warrants | $ 200 |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 436,510 |  |  |  |  |  |  | 515,876 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | 6.3 |  |  |  |  | $ 6.3 |  |  |
The November 2022 A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 436,510 |  |  |  |  |  |  | 515,876 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | 6.3 |  |  |  |  | $ 6.3 |  |  |
The November 2022 A-1 and A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 6.3 |  |  |  |  |  |  |  |  |  |
The Amended November 2022 A-1 and A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.5 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 100 |  |  |  |  |  |  |  |  |  |
The 2022 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 327,860 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 6.3 | $ 6.3 |  |  |  |  |  |  |  |  |
September 2022 Warrants Exercisable for 1.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 238,574 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.5 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 46 |  |  |  |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 535,716 |  |  |  |  |  |  |  | 1,071,434 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | 6.3 |  |  |  |  |  | $ 18.55 |  |
Amended November 2021 Warrants Exercisable for 6.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 6.3 | $ 6.3 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 267,860 |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 1,500 |  |  |  |  |  |  |  |  |
Amended November 2021 Warrants Exercisable for 1.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.5 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 100 |  |  |  |  |  |  |  |  |  |
The July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  | 137,145 | 197,105
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 57.75 |  |  |  |  |  |  |  | $ 57.75
Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 77,145 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 6.3 | $ 6.3 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 60,000 |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 14,000 | $ 400 |  |  |  |  |  |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 5,076,928 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.5 |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 400 |  |  |  |  |  |  |  |  |  |

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