Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Deferred Tax Assets, Net, Total | $ 0 | |
| Domestic Tax Jurisdiction [Member] | ||
| Operating Loss Carryforwards | $ 376,000 | |
| Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | ||
| Open Tax Year | 2021 2022 2023 2024 2025 | |
| Open Tax Period (Year) | 3 years | |
| State and Local Jurisdiction [Member] | ||
| Operating Loss Carryforwards | $ 358,000 | |
| State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | ||
| Open Tax Period (Year) | 4 years | |