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Note 1 - Summary of Significant Accounting Policies - Impact on Segment Expansion (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Financing Receivable, amortized cost $ 640,480 $ 622,414    
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  
Accounting Standards Update 2016-13 [Member] | Previously Reported [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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       155,445
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]        
Financing Receivable, amortized cost 139,034 133,601    
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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       0
Residential Portfolio Segment [Member] | Multifamily [Member]        
Financing Receivable, amortized cost 36,805 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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]        
Financing Receivable, amortized cost 67,755 63,301    
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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [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 58,406 56,373    
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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       64,029
Commercial Real Estate [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 [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 [Member] | Commercial Real Estate Loan [Member] | Accounting Standards Update 2016-13 [Member] | Previously Reported [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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       21,874
Construction [Member] | One-to-four Family Residential Construction [Member]        
Financing Receivable, amortized cost 15,245 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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       0
Construction [Member] | Other Construction, Development and Land [Member]        
Financing Receivable, amortized cost 75,811 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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]        
Financing Receivable, amortized cost 184,706 168,645    
Commercial Portfolio Segment [Member] | Commercial Business [Member]        
Financing Receivable, amortized cost $ 62,718 $ 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] | Accounting Standards Update 2016-13 [Member] | Previously Reported [Member]        
Financing Receivable, amortized cost       $ 60,806