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Note 11 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Income Tax Expense (Benefit) | $ 36 | $ 39 |
Operating Loss Carryforwards |  |  | $ 295,198
Operating Loss Carryforwards, Subject to Expiration |  |  | $ 227,781
Operating Loss Carry Forwards Annual Limit | 14,284 |  |
Unrecognized Tax Benefits | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 0 |  |
Rights [Member] |  |  |
Threshold Percentage of Beneficial Ownership for Significant Dilution in Ownership Interest | 4.90% |  |
Class of Warrant or Right Number of Rights Per Common Stock Share | 1 |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | 0.001 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 7.7 |  |
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights | 4.90% |  |

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