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Note 1 - Summary of Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Accrued interest receivable  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 2,100,000 $ 2,400,000  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Accrued interest receivable  
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss $ 18,000 $ 18,000  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable Accrued interest receivable  
Financing Receivable, Accrued Interest, after Allowance for Credit Loss $ 2,400,000 $ 2,300,000  
Loan Payments Delinquency Period Beyond Which Loan is Considered Past Due (Day) 90 days    
Nonaccrual Loans Performance Period 6 months    
Collateral Dependent Loans, Value of Significant Properties $ 200,000    
Number of Operating Segments 1    
Number of Reportable Segments 1    
Retained Earnings (Accumulated Deficit) $ 105,290,000 $ 97,105,000  
Unfunded Loan Commitment [Member]      
Off-Balance-Sheet, Credit Loss, Liability     $ 131,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, Allowance for Credit Loss     561,000
Retained Earnings (Accumulated Deficit)     (529,000)
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment [Member]      
Off-Balance-Sheet, Credit Loss, Liability     $ 131,000
Bank Overdrafts [Member]      
Financing Receivable, Threshold Period Past Due, Writeoff (Day) 45 days    
Consumer Portfolio Segment [Member]      
Financing Receivable, Threshold Period Past Due, Writeoff (Day) 90 days    
Maximum [Member]      
Maturity of Time Deposits (Day) 90 days    
Property, Plant and Equipment, Useful Life 39 years    
Minimum [Member]      
Property, Plant and Equipment, Useful Life 15 years