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Note 4 - Loans and Allowance for Loan Losses - Collateral Dependent Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Collateral Dependent Loans   $ 1,935 $ 1,973
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans   372 315
Commercial Portfolio Segment [Member]      
Collateral Dependent Loans   $ 195 $ 147
Real Estate [Member]      
Collateral Dependent Loans $ 3,412    
Real Estate [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]      
Collateral Dependent Loans 1,705    
Real Estate [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]      
Collateral Dependent Loans 0    
Real Estate [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans 587    
Real Estate [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans 0    
Real Estate [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]      
Collateral Dependent Loans 0    
Real Estate [Member] | Construction [Member] | Other Construction, Development and Land [Member]      
Collateral Dependent Loans 52    
Real Estate [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Collateral Dependent Loans 1,068    
Real Estate [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member]      
Collateral Dependent Loans 153    
Real Estate, Other [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Construction [Member] | Other Construction, Development and Land [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Collateral Dependent Loans 0    
Real Estate, Other [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]      
Collateral Dependent Loans 153    
Collateral Pledged [Member]      
Collateral Dependent Loans 3,565    
Allowance for Credit Loss 10    
Collateral Pledged [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]      
Collateral Dependent Loans 1,705    
Allowance for Credit Loss 10    
Collateral Pledged [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]      
Collateral Dependent Loans 0    
Allowance for Credit Loss 0    
Collateral Pledged [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans 587    
Allowance for Credit Loss 0    
Collateral Pledged [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Collateral Dependent Loans 0    
Allowance for Credit Loss 0    
Collateral Pledged [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]      
Collateral Dependent Loans 0    
Allowance for Credit Loss 0    
Collateral Pledged [Member] | Construction [Member] | Other Construction, Development and Land [Member]      
Collateral Dependent Loans 52    
Allowance for Credit Loss 0    
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Collateral Dependent Loans 1,068    
Allowance for Credit Loss 0    
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] | Commercial Business [Member]      
Collateral Dependent Loans 153    
Allowance for Credit Loss $ 0