Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Summary of Significant Accounting Policies - Impact of Adoption of ASU (Details)

v3.23.1
Note 1 - Summary of Significant Accounting Policies - Impact of Adoption of ASU (Details) - USD ($)
Mar. 31, 2023
Jan. 01, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Allowance for credit losses for all loans $ 979,000 $ 624,000 $ 624,000 $ 785,000 $ 779,000
Allowance for credit losses on off-balance sheet exposures 6,000 0      
First Mortgage Loans [Member] | One To Four Family Residential [Member]          
Allowance for credit losses for all loans 890,000 581,000 581,000 729,000 675,000
First Mortgage Loans [Member] | Multifamily [Member]          
Allowance for credit losses for all loans 41,000 19,000 19,000 27,000 69,000
First Mortgage Loans [Member] | Commercial Real Estate [Member]          
Allowance for credit losses for all loans 46,000 19,000 19,000 26,000 25,000
Consumer Portfolio Segment [Member]          
Allowance for credit losses for all loans $ 2,000 5,000 5,000 $ 3,000 $ 10,000
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses for all loans   1,008,000      
Allowance for credit losses on off-balance sheet exposures   5,000      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member] | First Mortgage Loans [Member] | One To Four Family Residential [Member]          
Allowance for credit losses for all loans   916,000      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member] | First Mortgage Loans [Member] | Multifamily [Member]          
Allowance for credit losses for all loans   42,000      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member] | First Mortgage Loans [Member] | Commercial Real Estate [Member]          
Allowance for credit losses for all loans   48,000      
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]          
Allowance for credit losses for all loans   2,000      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Allowance for credit losses for all loans   384,000 384,000    
Allowance for credit losses on off-balance sheet exposures   5,000      
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | First Mortgage Loans [Member] | One To Four Family Residential [Member]          
Allowance for credit losses for all loans   335,000 335,000    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | First Mortgage Loans [Member] | Multifamily [Member]          
Allowance for credit losses for all loans   23,000 23,000    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | First Mortgage Loans [Member] | Commercial Real Estate [Member]          
Allowance for credit losses for all loans   29,000 29,000    
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member]          
Allowance for credit losses for all loans   $ (3,000) $ (3,000)