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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