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Note 4 - Loans and Allowance for Credit Losses (Details Textual)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process $ 621,246,000 $ 563,517,000    
Off-balance-sheet Commitments to Related Parties 2,600,000 2,700,000    
Financing Receivable, Nonaccrual, Interest Income 0      
Financing Receivable, Modified in Period, Amount 0 0 $ 0  
Financing Receivable, Modified, Commitment to Lend 0 0    
Financing Receivables, Troubled Debt Restructuring, Write-down   0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts     1  
Financing Receivable, Modified, Subsequent Default 264,000   $ 290,000  
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 614,409,000 557,958,000    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 8,005,000 6,772,000 6,083,000 $ 6,625,000
Financial Asset Acquired with Credit Deterioration [Member]        
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 234,000 244,000    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0 0    
Nonaccrual [Member]        
Financing Receivable, Credit Loss, Expense (Reversal)     $ 7,000  
Unfunded Loan Commitment [Member]        
Off-Balance-Sheet, Credit Loss, Liability 131,000      
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) 0      
Residential Mortgage Segment [Member]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process $ 785,000 $ 1,000,000