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Note 4 - Loans and Allowance for Credit Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Loans $ 621,377 $ 614,409
Nonperforming Financial Instruments [Member]    
Nonaccrual, No Allowance 1,594 1,628
Nonaccrual, With an Allowance 86 123
Nonaccrual 1,680 1,751
Past Due, Still Accruing 0 0
Loans 1,680 1,751
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]    
Nonaccrual, No Allowance 1,094 1,120
Nonaccrual, With an Allowance 0 36
Nonaccrual 1,094 1,156
Past Due, Still Accruing 0 0
Loans 1,094 1,156
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]    
Nonaccrual, No Allowance 0 0
Nonaccrual, With an Allowance 0 0
Nonaccrual 0 0
Past Due, Still Accruing 0 0
Loans 0 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Nonaccrual, No Allowance 446 454
Nonaccrual, With an Allowance 0 0
Nonaccrual 446 454
Past Due, Still Accruing 0 0
Loans 446 454
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Nonaccrual, No Allowance 0 0
Nonaccrual, With an Allowance 0 0
Nonaccrual 0 0
Past Due, Still Accruing 0 0
Loans 0 0
Nonperforming Financial Instruments [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]    
Nonaccrual, No Allowance 0 0
Nonaccrual, With an Allowance 86 87
Nonaccrual 86 87
Past Due, Still Accruing 0 0
Loans 86 87
Nonperforming Financial Instruments [Member] | Construction [Member] | Other Construction, Development and Land [Member]    
Nonaccrual, No Allowance 54 54
Nonaccrual, With an Allowance 0 0
Nonaccrual 54 54
Past Due, Still Accruing 0 0
Loans 54 54
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Nonaccrual, No Allowance 0 0
Nonaccrual, With an Allowance 0 0
Nonaccrual 0 0
Past Due, Still Accruing 0 0
Loans 0 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
Nonaccrual, No Allowance 0 0
Nonaccrual, With an Allowance 0 0
Nonaccrual 0 0
Past Due, Still Accruing 0 0
Loans $ 0 $ 0