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Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructuring by Accrual Status (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Total TDRS $ 823,000 $ 1,262,000  
Total TDRS 823,000 1,262,000  
TDR related allowance for loan losses 0 7,000  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Total TDRS 124,000 216,000  
Total TDRS 124,000 216,000  
TDR related allowance for loan losses 0 0  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Total TDRS 381,000 585,000  
Total TDRS 381,000 585,000  
TDR related allowance for loan losses 0 0  
Commercial Portfolio Segment [Member]      
Total TDRS 40,000 174,000 $ 43,000
Total TDRS 40,000 174,000 43,000
TDR related allowance for loan losses 0 0  
Consumer Portfolio Segment [Member]      
Total TDRS     294,000
Total TDRS     $ 294,000
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Total TDRS 278,000 287,000  
Total TDRS 278,000 287,000  
TDR related allowance for loan losses 0 7,000  
Performing Financial Instruments [Member]      
Total TDRS 529,000 975,000  
Total TDRS 529,000 975,000  
Performing Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Total TDRS 108,000 216,000  
Total TDRS 108,000 216,000  
Performing Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Total TDRS 381,000 585,000  
Total TDRS 381,000 585,000  
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]      
Total TDRS 40,000 174,000  
Total TDRS 40,000 174,000  
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Total TDRS 0 0  
Total TDRS 0 0  
Nonperforming Financial Instruments [Member]      
Total TDRS 294,000 287,000  
Total TDRS 294,000 287,000  
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Total TDRS 16,000 0  
Total TDRS 16,000 0  
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Total TDRS 0 0  
Total TDRS 0 0  
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]      
Total TDRS 0 0  
Total TDRS 0 0  
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Total TDRS 278,000 287,000  
Total TDRS $ 278,000 $ 287,000