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Note 4 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Interest Receivable $ 4,442,000   $ 4,788,000
Financing Receivable, Nonaccrual, Interest Income 0 $ 0  
Financing Receivable, Modified in Period, Amount   0  
Financing Receivable, Modified, Subsequent Default   $ 0  
Mortgage Loans in Process of Foreclosure, Amount 0    
Unfunded Loan Commitment [Member]      
Off-Balance-Sheet, Credit Loss, Liability 131,000   131,000
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) 0    
Residential Real Estate [Member]      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure 2,000   1,000
Commercial Business [Member]      
Financing Receivable, Modified in Period, Amount $ 2,000,000    
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 3.00%    
Financing Receivable, Modified, Payment Extension, Period (Month) 3 months    
Financing Receivable Modification, Increase (Decrease) from Modification $ 0    
Financing Receivable, Modified, Payment Deferral, Period (Month) 0 months    
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00%    
Accrued Interest Receivable [Member]      
Interest Receivable $ 2,400,000   $ 2,300,000