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Note 14 - Common Stock Warrants and Warrant Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2024 | May 30, 2024 | Dec. 21, 2023 | May 01, 2023 | Sep. 09, 2022 | Jun. 30, 2024 | May 31, 2024 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 27, 2024 | Mar. 31, 2024 | May 31, 2023 | Dec. 31, 2022 | Nov. 10, 2022 | Nov. 30, 2021 | Sep. 09, 2020 | Jul. 31, 2020
Class of Warrant or Right, Issued During Period |  |  |  |  |  |  |  |  | 10,730,589,000 | 217,312,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 1.41 | $ 50.96 |  |  |  | $ 269.54 |  |  |  |
Class of Warrant or Right, Exercised During Period |  |  |  |  |  |  |  |  | 90,381,000 | 72,252,000 |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  |  |  |  |  | $ (114) | $ (272) |  |  |  |  |  |  |  |
Class of Warrant or Right, Forfeited During Period |  |  |  |  |  |  |  |  |  | (0) |  |  |  |  |  |  |  |
Prefunded Warrants 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period | 2,041,814 |  |  |  |  |  |  |  | 2,041,814,000 |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares |  |  |  |  |  |  |  | 2,041,814 | 2,041,814 |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value | $ 20 |  |  |  |  |  |  |  | $ 21 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 0.01 |  |  |  |  |  |  |  |  |  | $ 0.66 |  |  |  |  |  |  |
Adjustment to Warrant Exercise Price, Deemed Dividend |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Forfeited During Period |  |  |  |  |  |  |  |  | 2,041,814,000 |  |  |  |  |  |  |  |  |
The July 2024 Series F-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 3,537,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2024 Series F-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 3,537,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2024 Series F-3 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 3,537,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2024 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  |  | $ 0.66 |  |  |  |  |  |  |
Adjustment to Warrant Exercise Price, Deemed Dividend |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  | 90,381 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 2.57 |  |  |  |  |  |  |  |  |
March 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 28,572 |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 4.9 |  |  |  |  |  |  | 4.9 |  |  | $ 0.14 |  |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 72,256 |  |  |  |  |  |  |  | 2,528,848 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 8.75 |  |  |  |  |  |  | 8.75 | $ 0.25 |  |  |  |  |  |  |  |
The May 2023 B-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 72,528 |  |  |  |  |  |  |  |  |  |  | 2,538,464 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 45.5 |  |  |  |  |  |  |  | 1.3 |  |  | $ 1.3 |  |  |  |  |
Class of Warrant or Right, Exercised During Period |  | 18,132 | 634,616 |  |  | 54,396 |  |  |  |  |  |  |  |  |  |  |  |
The May 2023 B-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 72,528 |  |  |  |  |  |  |  |  |  |  | 2,538,464 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 45.5 |  |  |  |  |  |  |  |  |  |  | $ 1.3 |  |  |  |  |
Class of Warrant or Right, Exercised During Period |  | 54,120 | 1,894,232 |  |  | 18,408 |  |  |  |  |  |  |  |  |  |  |  |
May 2023 Warrants Amended By 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  | $ 0.25 |  |  |  |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  | 2,528,848 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 8.75 |  |  |  |  |  |  | 8.75 |  |  |  | $ 1.3 |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ (170) |  |  | $ (47) |  |  |  |  |  |  |  |  |  |  |  |
May 2023 Warrants Amended By 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 2.5 |  |  |  |  |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 14,741 |  |  |  |  |  |  | 12,473 |  |  |  | 436,510 |  | 515,876 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  |  |  |  |  |  | $ 220.5 |  |  |  | $ 52.5 |  | $ 6.3 |  |  |
The November 2022 A-1 Warrants [Member] | Post-amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 12,473 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 14,741 |  |  |  |  |  |  |  |  |  |  | 436,510 |  | 515,876 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.3 |  |  |
Class of Warrant or Right, Forfeited During Period |  |  |  |  |  |  | 14,741 |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-2 Warrants [Member] | Post-amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 12,473 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-1 and A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  |  |  |  |  |  |  |  |  |  | $ 6.3 |  |  |  |  |
The Amended November 2022 A-1 and A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 52.5 |  |  |  |  |  |  |  |  |  |  | $ 1.5 |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | $ (74) |  | (16) |  |  |  |  |  |  |  |  |  |  |  |
November 2022 Warrants Amended By 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 2.5 |  |  |  |  |  |  |  |  |
The 2022 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 9,371 |  |  | 327,860 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  |  | $ 6.3 |  |  |  |  |  |  |  |  |  |  |  |  |
September 2022 Warrants Amended in 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 6,819 |  |  |  |  |  |  |  |  |  |  | 238,574 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 52.5 |  |  | 52.5 |  |  |  |  |  |  |  | $ 1.5 |  |  |  |  |
September 2022 Warrants Amended in 2024 Warrant Reprise Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  | 5,104 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 2.5 |  |  |  |  |  |  |  |  |
September 2022 Warrants Amended [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  |  | $ 7 |  |  |  |  |  |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 30,616 |  | 535,716 |  |  |  |  |  |  |  |  |  |  |  | 1,071,434 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 649.25 |  |  |  |  |  |  | 220.5 |  |  |  |  |  |  | $ 18.55 |  |
Amended November 2021 Warrants Exercisable for 6.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  | $ 6.3 | $ 6.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period |  |  |  |  | 7,654 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | $ (100) |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2021 Warrants Adjusted From 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 15,308 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amended November 2021 Warrants Exercisable for 1.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 52.5 |  | $ 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 5,635 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 197,105
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 2,021.25 |  |  |  |  |  |  | $ 2,021.25 |  |  |  |  |  |  |  |  | $ 57.75
Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  | 77,145 |  |  |  |  | 3,921 |  |  |  |  |  |  |  | 137,145 |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  | $ 6.3 | $ 6.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period |  | 1,715 |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | $ (14,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,206 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 52.5 |  |  |  |  |  |  | $ 52.5 |  |  |  |  |  |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 145,056 |  | 5,076,928 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 1.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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