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Note 4 - Loans and Allowance for Loan Losses - Recorded Investment in Nonperforming Loans (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Nonaccrual $ 1,525  
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 582,944,000 $ 557,958,000
Nonperforming Financial Instruments [Member]    
Nonaccrual, No Allowance 1,486,000 [1] 1,403,000
Financing Receivable, Excluding Accrued Interest, Nonaccrual 1,525,000  
Past Due, Still Accruing 0 87,000
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 1,525,000 1,490,000
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]    
Nonaccrual, No Allowance [1] 1,143,000  
Financing Receivable, Excluding Accrued Interest, Nonaccrual 1,182,000  
Past Due, Still Accruing 0  
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 1,182,000  
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Multifamily [Member]    
Nonaccrual, No Allowance [1] 0  
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0  
Past Due, Still Accruing 0  
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 0  
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]    
Nonaccrual, No Allowance   744,000
Past Due, Still Accruing   83,000
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss   827,000
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Nonaccrual, No Allowance   51,000
Past Due, Still Accruing   0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss   51,000
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Nonaccrual, No Allowance   0
Past Due, Still Accruing   0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss   0
Nonperforming Financial Instruments [Member] | Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Nonaccrual, No Allowance 21,000 [1] 81,000
Financing Receivable, Excluding Accrued Interest, Nonaccrual 21,000  
Past Due, Still Accruing 0 0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 21,000 81,000
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Nonaccrual, No Allowance 270,000 [1] 372,000
Financing Receivable, Excluding Accrued Interest, Nonaccrual 270,000  
Past Due, Still Accruing 0 0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 270,000 372,000
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]    
Nonaccrual, No Allowance 0 [1] 0
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0  
Past Due, Still Accruing 0 4,000
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 0 4,000
Nonperforming Financial Instruments [Member] | Construction [Member] | One-to-four Family Residential Construction [Member]    
Nonaccrual, No Allowance [1] 0  
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0  
Past Due, Still Accruing 0  
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 0  
Nonperforming Financial Instruments [Member] | Construction [Member] | Other Construction, Development and Land [Member]    
Nonaccrual, No Allowance [1] 52,000  
Financing Receivable, Excluding Accrued Interest, Nonaccrual 52,000  
Past Due, Still Accruing 0  
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss 52,000  
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]    
Nonaccrual, No Allowance 0 [1] 155,000
Financing Receivable, Excluding Accrued Interest, Nonaccrual 0  
Past Due, Still Accruing 0 0
Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss $ 0 $ 155,000
[1] Includes nonaccrual loans with no ACL and are also included in Total Nonaccrual loans of $1,525.