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v3.23.2

Note 5 - Income Taxes (Details Textual) $ in Thousands | 6 Months Ended
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Jun. 30, 2023 USD ($)
Deferred Tax Assets, Net, Total | $ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |
Operating Loss Carryforwards | $ 342,000
Open Tax Year | 2019 2020 2021 2022
Open Tax Period (Year) | 3 years
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |
Operating Loss Carryforwards | $ 296,000
Open Tax Year | 2018 2019 2020 2021 2022
Open Tax Period (Year) | 4 years

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