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Note 11 - Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 01, 2023 | Sep. 09, 2022 | Jun. 30, 2024 | May 31, 2024 | Dec. 31, 2023 | May 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Mar. 24, 2024 | 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 |  |  | $ 37.4 |  | $ 50.96 |  | $ 37.4 | $ 76.23 | $ 37.4 | $ 76.23 |  |  | $ 269.54 |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  | 90,381,000 | (0) |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  |  |  | $ (80) | $ 216 | $ 114 | $ 216 |  |  |  |  |  |  |
Class of Warrant or Right, Forfeited During Period |  |  |  |  |  |  |  |  | (14,741,000) | 0 |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  |  |  |  |  | $ 80 | $ (216) | $ (114) | $ (216) |  |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 90,381 |  |  |  | 90,381 |  | 90,381 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2.57 |  |  |  | $ 2.57 |  | $ 2.57 |  |  |  |  |  |  |  |
March 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  | 28,572 | 28,572 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | 4.9 |  |  |  | 4.9 |  | 4.9 |  | $ 4.9 |  |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 72,256 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 8.75 |  | $ 8.75 |  | 8.75 |  | 8.75 |  |  |  |  |  |  |  |
The May 2023 B-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 72,528 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 45.5 | $ 45.5 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 54,396 |  | 18,132 |  |  |  |  |  |  |  |  |  |  |  |
The May 2023 B-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 72,528 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 45.5 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  | 18,408 |  | 54,120 |  |  |  |  |  |  |  |  |  |  |  |
May 2023 Warrants Amended By 2023 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  | $ 8.75 |  |  |  |  |  |  |  |  |  |  |  |
May 2023 Warrants Amended By 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2.5 |  |  |  | 2.5 |  | 2.5 |  |  |  |  |  |  |  |
May 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 72,256 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 8.75 |  | $ 45.5 |  | $ 8.75 |  | $ 8.75 |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 47 |  | $ 170 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ (47) |  | $ (170) |  |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 12,473 |  |  | 12,473 | 12,473 |  | 12,473 |  |  |  |  | 14,741 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 220.5 |  |  | $ 52.5 | $ 220.5 |  | $ 220.5 |  |  |  |  | $ 220.5 |  |  |
The November 2022 A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 12,473 |  |  |  |  |  |  |  | 14,741 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220.5 |  |  |
Class of Warrant or Right, Forfeited During Period |  |  |  | 14,741 |  |  |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-1 and A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 220.5 |  |  |  |  |  |  |  |  |  |  |
The Amended November 2022 A-1 and A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  | $ 52.5 |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ (16) |  |  | $ (74) |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 16 |  |  | $ 74 |  |  |  |  |  |  |  |  |  |  |
November 2022 Warrants Amended By 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2.5 |  |  |  | $ 2.5 |  | $ 2.5 |  |  |  |  |  |  |  |
The 2022 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 9,371 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 220.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 2022 Warrants Amended in 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 6,819 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | 52.5 |  |  |  | $ 52.5 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 5,104 |  | 5,104 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2.5 |  |  |  | $ 2.5 |  | $ 2.5 |  |  |  |  |  |  |  |
September 2022 Warrants Amended [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ (6) |  |  | $ (28) |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  |  | $ 6 |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 15,308 |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,616 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 220.5 |  |  |  | 220.5 |  | 220.5 |  |  |  |  |  | $ 649.25 |  |
Amended November 2021 Warrants Exercisable for 6.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 220.5 | $ 220.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 7,654 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ (1,500) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 52.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ (100) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,921 | 5,635
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  | $ 2,021.25 |  |  |  | $ 2,021.25 |  | $ 2,021.25 |  |  |  |  |  |  |  | $ 2,021.25
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 | $ 220.5 | $ 220.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  | 1,715 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ (9,000) | $ (400) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ 9,000 | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 145,056 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 52.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ (400) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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