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Note 4 - Loans and Allowance for Credit Losses - Collateral Dependent Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Real Estate [Member]    
Collateral Dependent Loans $ 6,290 $ 6,435
Equipment [Member]    
Collateral Dependent Loans 1,866 1,926
Real Estate, Other [Member]    
Collateral Dependent Loans 149 155
Collateral Pledged [Member]    
Collateral Dependent Loans 8,305 8,516
Allowance for Credit Loss 1,288 1,287
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Real Estate [Member]    
Collateral Dependent Loans 1,563 1,613
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 1,563 1,613
Allowance for Credit Loss 0 0
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Real Estate [Member]    
Collateral Dependent Loans 639 714
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 639 714
Allowance for Credit Loss 0 0
Residential Portfolio Segment [Member] | Multifamily [Member] | Real Estate [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | Multifamily [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | Multifamily [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Residential Portfolio Segment [Member] | Multifamily [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 0 0
Allowance for Credit Loss 0 0
Construction [Member] | One-to-four Family Residential Construction [Member] | Real Estate [Member]    
Collateral Dependent Loans 91 90
Construction [Member] | One-to-four Family Residential Construction [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Construction [Member] | One-to-four Family Residential Construction [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Construction [Member] | One-to-four Family Residential Construction [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 91 90
Allowance for Credit Loss 55 54
Construction [Member] | Other Construction, Development and Land [Member] | Real Estate [Member]    
Collateral Dependent Loans 107 106
Construction [Member] | Other Construction, Development and Land [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Construction [Member] | Other Construction, Development and Land [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Construction [Member] | Other Construction, Development and Land [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 107 106
Allowance for Credit Loss 0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Real Estate [Member]    
Collateral Dependent Loans 3,890 3,912
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 3,890 3,912
Allowance for Credit Loss 0 0
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Real Estate [Member]    
Collateral Dependent Loans 0 0
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Equipment [Member]    
Collateral Dependent Loans 1,866 1,926
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 149 155
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 2,015 2,081
Allowance for Credit Loss 1,233 1,233
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Real Estate [Member]    
Collateral Dependent Loans 0 0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Equipment [Member]    
Collateral Dependent Loans 0 0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Real Estate, Other [Member]    
Collateral Dependent Loans 0 0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Collateral Pledged [Member]    
Collateral Dependent Loans 0 0
Allowance for Credit Loss $ 0 $ 0