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Note 11 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Income Tax Expense (Benefit) | $ 53 | $ 28 | $ 92 | $ 51 |
Operating Loss Carryforwards |  |  |  |  | $ 290,233
Operating Loss Carryforwards, Subject to Expiration |  |  |  |  | $ 227,781
Operating Loss Carry Forwards Annual Limit | 14,284 |  | 14,284 |  |
Unrecognized Tax Benefits | 0 |  | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 0 |  | $ 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 |  | 0.001 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 7.26 |  | $ 7.26 |  |
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights |  |  | 4.90% |  |

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