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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023
Deferred Tax Assets, Net, Total |  | $ 0
Domestic Tax Jurisdiction [Member] |  |
Operating Loss Carryforwards | $ 356,000 |
Domestic Tax Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Open Tax Year | 2020 2021 2022 2023 2024 |
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] |  |
Open Tax Year | 2021 |
Open Tax Period (Year) | 3 years |
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards | $ 334,000 |
Open Tax Period (Year) | 4 years |

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