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Note 4 - Loans and Allowance for Credit Losses (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Interest Receivable $ 4,218,000   $ 4,218,000   $ 4,788,000
Financing Receivable, Nonaccrual, Interest Income 0 $ 0 0 $ 0  
Financing Receivable, Modified in Period, Amount   0   0  
Financing Receivable, Modified, Subsequent Default     0 0  
Financing Receivable, Modified, Commitment to Lend 0   0   0
Mortgage Loans in Process of Foreclosure, Amount 0   0   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 $ 0 0 $ 0  
Residential Real Estate [Member]          
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     29,000   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 Modification, Increase (Decrease) from Modification     $ 0    
Financing Receivable, Modified, Payment Deferral, Period (Year) 0 years   0 years    
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification     0.00%    
Accrued Interest Receivable [Member]          
Interest Receivable $ 2,200,000   $ 2,200,000   $ 2,300,000