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Note 5 - Income Taxes (Details Textual) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Unrecognized Tax Benefits, Ending Balance | $ 1,200
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 0
Deferred Tax Assets, Net, Total | 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] |
Operating Loss Carryforwards, Total | $ 347,000
Open Tax Year | 2018 2019 2020
Open Tax Period (Year) | 3 years
Domestic Tax Authority [Member] | California Franchise Tax Board [Member] |
Operating Loss Carryforwards, Total | $ 259,000
Open Tax Year | 2017 2018 2019 2020
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] |
Open Tax Period (Year) | 4 years

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