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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Assets, Operating Loss Carryforwards $ 3,249 $ 3,787
Deferred Tax Assets, Tax Credit Carryforwards, Other 28,700  
Income Taxes Receivable 37,000 $ 33,700
Tax Credit Carryforward, Amount 20,200  
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]    
Operating Loss Carryforwards 33,500  
Deferred Tax Assets, Operating Loss Carryforwards $ 3,200  
Open Tax Year 2020 2021 2022 2023  
Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member]    
Open Tax Year 2021 2022 2023 2024