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Note 1 - Summary of Significant Accounting Policies - Impact on Segment Expansion (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Financing Receivable, amortized cost $ 622,414   $ 566,548
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   $ 0  
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   564,730  
Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     564,730
Residential Portfolio Segment [Member] | Residential Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   (155,445)  
Residential Portfolio Segment [Member] | Residential Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   0  
Residential Portfolio Segment [Member] | Residential Loan [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     155,445
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]      
Financing Receivable, amortized cost 133,601    
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   116,392  
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   116,392  
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     0
Residential Portfolio Segment [Member] | Multifamily [Member]      
Financing Receivable, amortized cost 39,946    
Residential Portfolio Segment [Member] | Multifamily [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   38,962  
Residential Portfolio Segment [Member] | Multifamily [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   38,962  
Residential Portfolio Segment [Member] | Multifamily [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Financing Receivable, amortized cost 63,301   59,333
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   92  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   59,077  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     58,985
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Financing Receivable, amortized cost     64,265
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   (7,262)  
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   56,767  
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     64,029
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Financing Receivable, amortized cost 168,645    
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   (62)  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   161,270  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     161,332
Construction [Member] | Construction Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   (42,259)  
Construction [Member] | Construction Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   0  
Construction [Member] | Construction Loans [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     42,259
Construction [Member] | Land Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   (21,874)  
Construction [Member] | Land Loan [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   0  
Construction [Member] | Land Loan [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     21,874
Construction [Member] | One-to-four Family Residential Construction [Member]      
Financing Receivable, amortized cost 15,667    
Construction [Member] | One-to-four Family Residential Construction [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   16,575  
Construction [Member] | One-to-four Family Residential Construction [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   16,575  
Construction [Member] | One-to-four Family Residential Construction [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     0
Construction [Member] | Other Construction, Development and Land [Member]      
Financing Receivable, amortized cost 76,669    
Construction [Member] | Other Construction, Development and Land [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   47,633  
Construction [Member] | Other Construction, Development and Land [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   47,633  
Construction [Member] | Other Construction, Development and Land [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     0
Commercial Portfolio Segment [Member]      
Financing Receivable, amortized cost     60,976
Commercial Portfolio Segment [Member] | Commercial Business [Member]      
Financing Receivable, amortized cost $ 68,212    
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]      
Financing Receivable, amortized cost   7,248  
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Financing Receivable, amortized cost   $ 68,054  
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Previously Reported [Member] | Accounting Standards Update 2016-13 [Member]      
Financing Receivable, amortized cost     $ 60,806