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Note 4 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2021
Mortgage Loans in Process of Foreclosure, Amount $ 63,000   $ 63,000     $ 0    
Interest Receivable 4,336,000   4,336,000   $ 4,285,000      
Financing Receivable, Excluding Accrued Interest, Nonaccrual 1,525   1,525          
Financing Receivable, Nonaccrual, Interest Income 0   0          
Financing Receivable, Modified in Period, Amount 0 $ 0 0 $ 0        
Financing Receivable, Modified, Subsequent Default 0 0 0 0        
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 0   0   0      
Financing Receivables, Troubled Debt Restructuring, Write-down   0   0        
Impaired Financing Receivable, Interest Income, Cash Basis Method   0   0        
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 582,944,000   582,944,000   557,958,000      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 7,515,000 6,394,000 7,515,000 6,394,000 6,772,000 $ 7,323,000 $ 6,245,000 $ 6,083,000
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          
Financial Asset Acquired with Credit Deterioration [Member]                
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 239,000   239,000   244,000      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0 $ 10,000 0 $ 10,000 0      
Accrued Interest Receivable [Member]                
Interest Receivable $ 1,900,000   1,900,000          
Residential Real Estate [Member]                
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     $ 416,000   $ 104,000