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Note 10 - Common Stock Warrants and Warrant Liabilities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Jan. 16, 2026 | Oct. 31, 2025 | Oct. 16, 2025 | Oct. 15, 2025 | Sep. 27, 2024 | Jul. 29, 2024 | Nov. 01, 2022
Proceeds from Warrant Exercises |  | $ 292 | $ 614 |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ (5,837,607) | (0) |  |  |  |  |  |  |
Warrant Liabilities, Fair Value Disclosure | $ 0 |  | 0 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.06 |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants |  | $ (0) | $ 1,815 |  |  |  |  |  |  |
The January 2026 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Fair Value Adjustment of Warrants |  | $ 5,300,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.05 |  | $ 0.05 |  |  |  |  |  |
October 2025 Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |
Warrant Liabilities, Fair Value Disclosure |  | $ 33,700 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 0.002385 |  |  | $ 0.002385 | $ 5.5 | $ 0.05 |  |  |
Maximum Percentage of Common Stock Outstanding |  |  |  |  |  | 9.90% |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 22,664,040 |  |  |  |  |
The July 2024 Series F-1 and F-3 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  | $ 3.3 | $ 5.5 |
Payments for Repurchase of Warrants | $ 2,000 |  |  |  |  |  |  |  |  |
Series F-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  |  |  |  |  |  |  |  | 4.99% |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 254,545 |  | 254,545 |  |  |  |  |  |  |
Series F-1 Warrants [Member] | Election of the holder prior to the date of issuance [Member] |  |  |  |  |  |  |  |  |  |
Maximum Percentage of Common Stock Outstanding |  |  |  |  |  |  |  |  | 9.99% |
Series F-3 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 148,988 |  | 148,988 |  |  |  |  |  |  |
The November 2022 A-1 Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  | $ 1,102.5 |  |  |  |  |  |  |  | $ 1,102.5

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