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Note 5 - Qualified Affordable Housing Project Investment (Details Textual) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Investment Program, Proportional Amortization Method, Applied, Amortization Expense $ 84,000 $ 72,000  
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Income tax expense Income tax expense  
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense $ 103,000 $ 102,000  
Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization, Statement of Cash Flows [Extensible Enumeration] Income tax expense Income tax expense  
Other Assets [Member]      
Investments $ 1,500,000   $ 1,600,000
Other Liabilities [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments $ 168,000