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Note 4 - Loans and Allowance for Loan Losses - Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Principal loan balance   $ 571,682 $ 563,517    
Deferred loan origination fees and costs, net   1,217 1,213 $ 1,156  
Allowance for credit losses $ (6,772) (7,323) (6,772) (6,245) $ (6,083)
Loans, net   565,576 557,958    
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]          
Principal loan balance   122,675 116,269    
Deferred loan origination fees and costs, net   127      
Allowance for credit losses   (1,414) (1,036)    
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Principal loan balance   57,130 57,872    
Residential Portfolio Segment [Member] | Multifamily [Member]          
Principal loan balance   39,656 38,973    
Deferred loan origination fees and costs, net   (14)      
Allowance for credit losses   (381) (346)    
Construction [Member] | One-to-four Family Residential Construction [Member]          
Principal loan balance   19,071 16,575    
Deferred loan origination fees and costs, net   0      
Allowance for credit losses   (187) (206)    
Construction [Member] | Other Construction, Development and Land [Member]          
Principal loan balance   49,901 47,632    
Deferred loan origination fees and costs, net   (3)      
Allowance for credit losses   (489) (587)    
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Principal loan balance   161,968 161,362    
Deferred loan origination fees and costs, net   (91)      
Consumer Portfolio Segment [Member]          
Allowance for credit losses       (957) (988)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Deferred loan origination fees and costs, net   1,210 1,204 1,148  
Allowance for credit losses (530) (366) (531) (517) $ (527)
Consumer Portfolio Segment [Member] | Commercial Business [Member]          
Principal loan balance   67,228 68,066    
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]          
Principal loan balance   54,053 56,768    
Allowance for credit losses $ (991) $ (1,212) $ (881) $ (957)