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Note 21 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 4 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2024 | Aug. 29, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 19.9 | $ 21.73 | $ 72.12
Series C Preferred Stock [Member] |  |  |  |  |
Units Issued During Period, New Issues (in shares) |  | 812,500 | 159,966 |  |
Subsequent Event [Member] |  |  |  |  |
Units Issued During Period, New Issues (in shares) | 85,416 |  |  |  |
Proceeds From Issuance of Units | $ 1,050 |  |  |  |
Subsequent Event [Member] | Unit Warrants [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 1 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 12.31 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 24.62 |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 3 years |  |  |  |
Subsequent Event [Member] | Series C Preferred Stock [Member] |  |  |  |  |
Units Issued During Period, Number of Shares Per Unit (in shares) | 1 |  |  |  |

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