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Note 11 - Income Taxes (Details Textual) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2022 USD ($)
Income Tax Expense (Benefit) | $ 23 | $ 7
Operating Loss Carryforwards | 288,462 |
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] |  |
Term of Extended Rights Plan (Year) | 3 years |
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) | shares | 0.001 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 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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