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Note 4 - Loans and Allowance for Loan Losses (Details Textual)
6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loans and Leases Receivable, Gross $ 490,830,000 $ 566,548,000 $ 490,830,000    
Off-balance-sheet Commitments to Related Parties 2,600,000 2,700,000 2,600,000    
Financing Receivable, Allowance for Credit Loss, Ending Balance 6,083,000 6,772,000 6,083,000 $ 6,625,000 $ 5,061,000
Impaired Financing Receivable, Interest Income, Cash Basis Method 0        
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 0 $ 0 $ 0    
Financing Receivable, Modifications, Number of Contracts   0 0    
Financing Receivable, Troubled Debt Restructuring 1,262,000 $ 823,000 $ 1,262,000    
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down   $ 0 $ 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   0 1 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 278,000 $ 290.000    
Financing Receivable, Credit Loss, Expense (Reversal)   950,000 (325,000) $ 1,801,000  
Nonaccrual [Member]          
Financing Receivable, Credit Loss, Expense (Reversal)     7,000    
Purchased Credit Impaired Loans [Member]          
Financing Receivable, Allowance for Credit Loss, Ending Balance 31,000 0 31,000    
Financing Receivable, after Allowance for Credit Loss Including Principal, Interest, Fees and Penalties 339,000 289,000 339,000    
Overall Qualitative Factor [Member]          
Financing Receivable, Allowance for Credit Loss, Ending Balance 5,500,000 6,200,000 5,500,000    
Residential Mortgage Segment [Member]          
Loans and Leases Receivable, Gross 1,600,000 1,000,000.0 1,600,000    
Residential Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts       3  
Financing Receivable, Troubled Debt Restructuring       $ 358,000  
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Gross 51,921,000 60,976,000 51,921,000    
Financing Receivable, Allowance for Credit Loss, Ending Balance 873,000 1,046,000 873,000 $ 843,000 $ 595,000
Financing Receivable, Modifications, Number of Contracts       2  
Financing Receivable, Troubled Debt Restructuring $ 174,000 $ 40,000 $ 174,000 $ 43,000  
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts       1  
Financing Receivable, Troubled Debt Restructuring       $ 250,000  
Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts       1  
Financing Receivable, Troubled Debt Restructuring       $ 294,000