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Note 4 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Beginning balance, $ 8,560 $ 7,515 $ 8,005  
Provision for credit losses 463 290 1,103 $ 833
Charge-offs (104) (61) (289) (571)
Recoveries 40 42 140 191
Ending balance 8,959 7,786 8,959 7,786
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       561
Prior to Adoption of Asc 326 [Member]        
Beginning balance,       6,772
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]        
Beginning balance, 1,302 1,469 1,490  
Provision for credit losses (166) 70 (364) 96
Charge-offs 0 0 (4) (31)
Recoveries 15 6 29 21
Ending balance 1,151 1,545 1,151 1,545
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       423
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       1,036
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]        
Beginning balance, 559 363 406  
Provision for credit losses (127) 18 22 (115)
Charge-offs 0 (2) 0 (11)
Recoveries 0 2 4 2
Ending balance 432 381 432 381
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       (26)
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       531
Residential Portfolio Segment [Member] | Multifamily [Member]        
Beginning balance, 342 614 332  
Provision for credit losses 322 (112) 332 159
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance 664 502 664 502
Residential Portfolio Segment [Member] | Multifamily [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       (3)
Residential Portfolio Segment [Member] | Multifamily [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       346
Construction [Member] | One-to-four Family Residential Construction [Member]        
Beginning balance, 179 171 208  
Provision for credit losses (49) 7 (78) (19)
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance 130 178 130 178
Construction [Member] | One-to-four Family Residential Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       (9)
Construction [Member] | One-to-four Family Residential Construction [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       206
Construction [Member] | Other Construction, Development and Land [Member]        
Beginning balance, 803 460 804  
Provision for credit losses (204) 187 (205) 47
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Ending balance 599 647 599 647
Construction [Member] | Other Construction, Development and Land [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       13
Construction [Member] | Other Construction, Development and Land [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       587
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]        
Beginning balance, 2,347 2,016 2,119  
Provision for credit losses (123) 91 104 208
Charge-offs 0 0 0 0
Recoveries 0 0 1 0
Ending balance 2,224 2,107 2,224 2,107
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       (130)
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       2,029
Commercial Portfolio Segment [Member] | Commercial Business [Member]        
Beginning balance, 1,920 1,564 1,431  
Provision for credit losses 417 (219) 905 511
Charge-offs 0 0 0 (188)
Recoveries 1 0 2 8
Ending balance   1,345   1,345
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       (142)
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       1,156
Consumer Portfolio Segment [Member] | Commercial Business [Member]        
Ending balance 2,338 1,345 2,338 1,345
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]        
Beginning balance, 1,108 858 1,215  
Provision for credit losses 393 248 387 (54)
Charge-offs     (285) (341)
Recoveries 24 34 104 160
Ending balance 1,421 1,081 1,421 1,081
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]        
Beginning balance,       435
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Prior to Adoption of Asc 326 [Member]        
Beginning balance,       $ 881
Commercial Real Estate Loan [Member] | Other Consumer Loan [Member]        
Charge-offs $ (104) $ (59) $ (285)