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Note 10 - Common Stock Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 26, 2024 | Sep. 09, 2022 | Mar. 31, 2025 | Jan. 31, 2025 | Jun. 30, 2024 | May 31, 2024 | Dec. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Jan. 29, 2025 | Sep. 27, 2024 | May 30, 2023 | Nov. 30, 2022 | Sep. 30, 2022 | Jul. 31, 2022 | Nov. 30, 2021 | Jul. 31, 2020
Class of Warrant or Right, Issued During Period (in shares) |  |  |  |  |  |  |  | 0 | 28,572 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 2.36 |  |  |  | $ 50.96 | $ 2.36 | $ 56.63 | $ 1.41 |  |  |  |  |  |  |  |
Class of Warrant or Right, Repurchased |  |  |  |  |  |  |  | 2,017,666 |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants |  |  |  |  |  |  |  | $ 1,815 | $ (0) |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  | (930,511) | (0) |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Forfeited During Period |  |  |  |  |  |  |  |  | (0) |  |  |  |  |  |  |  |  |
Warrant Liability [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value |  |  | $ 0 |  |  |  | $ 334 | $ 0 | $ 232 |  |  |  |  |  |  |  |  |
Prefunded Warrants 2024 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 2,041,814 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares (in shares) |  |  |  |  |  |  |  | 2,041,814 |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value | $ 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |  | $ 0.66 |  |  |  |  |  |
The July 2024 Series F-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,537,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Repurchased |  |  | 1,272,725 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2024 Series F-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,537,212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2024 Series F-3 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares (in shares) |  |  | 527,784 | 402,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,537,212 |  |  |  |  |  |  |  |  |  | 3,134,485 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Repurchased |  |  | 744,941 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants |  |  | $ 1,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The July 2024 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.66 |  |  |  |  |  |
June 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 90,381 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 2.57 |  | $ 2.57 |  |  | $ 2.57 |  |  |  |  |  |  |  |  |  |
March 2024 Warrant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  | 28,572 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | 4.9 |  |  |  |  | 4.9 | $ 4.9 |  |  |  |  |  |  |  |  |
The December 2023 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  | 72,256 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | 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 (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 72,528 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  | $ 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 (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 72,528 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 (in dollars per share) |  |  |  |  | $ 8.75 |  | $ 8.75 |  |  |  |  |  |  |  |  |  |  |
May 2023 Warrants Amended By 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  | 12,473 |  |  |  |  |  |  |  |  | 14,741 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | 220.5 |  |  | $ 52.5 |  | 220.5 |  |  |  |  |  | $ 220.5 |  |  |  |
The November 2022 A-1 Warrants [Member] | Post-amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 12,473 |  |  |  |  |
The November 2022 A-2 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,741 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220.5 |  |  |  |
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 (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 12,473 |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220.5 |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  | $ 52.5 |  |  |  |  |
November 2022 Warrants Amended By 2024 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |
The 2022 Warrant Reprice Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,371 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220.5 |  |  |
September 2022 Warrants Amended in 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 6,819 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 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 (in shares) |  |  |  |  | 5,104 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |
The November 2021 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,616 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | 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 (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220.5 |  | $ 220.5 |
Class of Warrant or Right, Exercised During Period (in shares) |  | 7,654 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
November 2021 Warrants Adjusted From 2023 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 15,308 |  |  |  |  |
Amended November 2021 Warrants Exercisable for 1.50 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 52.5 |  |  |  |  |
The July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,635
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | 2,021.25 |  |  |  |  | 2,021.25 |  |  |  |  |  |  |  |  |  | $ 2,021.25
Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Shares (in shares) |  | 1,715 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,921 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220.5 | $ 220.5 |  |
The Amended July 2020 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 2,206 |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | 52.5 |  |  |  |  | $ 52.5 |  |  |  |  | $ 52.5 |  |  |  |  |
Series F-3 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 3,200,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued In Connection with Exercise of Warrants, Value |  |  |  |  |  |  |  | $ 348 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,200,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Repurchased |  |  |  |  |  |  |  | 744,941 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  |  |  |  |  | 527,784 |  |  |  |  |  |  |  |
Series F-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | 3,200,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,200,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 1.1 |  | $ 0.66 |  |  |  |  | $ 0.66 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Repurchased |  |  |  |  |  |  |  | 1,272,725 |  |  |  |  |  |  |  |  |  |

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