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Note 9 - Income Taxes (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Deferred Tax Assets, Net, Total $ 0
Domestic Tax Authority [Member]  
Operating Loss Carryforwards $ 334,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]  
Open Tax Year 2020 2021 2022 2023
Open Tax Period (Year) 3 years
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]  
Operating Loss Carryforwards $ 309,000
Open Tax Year 2019 2020 2021 2022
Open Tax Period (Year) 4 years