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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0 $ 0
Deferred Tax Assets, Valuation Allowance     19,404 $ 19,342  
Valuation Allowance, Deferred Tax Asset, Percentage of Net Deferred Tax Assets       100.00%  
Domestic Tax Jurisdiction [Member]          
Operating Loss Carryforwards     73,400    
State and Local Jurisdiction [Member]          
Operating Loss Carryforwards     $ 65,000