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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Beginning balance $ 7,515 $ 6,394 $ 6,772 $ 6,083  
Provision for credit losses 290 175 833 550  
Charge-offs (61) (77) (571) (287)  
Recoveries 42 74 191 220  
Ending balance 7,786 6,566 7,786 6,566  
Individually evaluated for impairment   0   0 $ 155
Collectively evaluated for impairment   6,566   6,566 6,617
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 7,786 6,566 7,786 6,566 6,772
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Beginning balance     561    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         561
Prior to Adoption of Asc 326 [Member]          
Beginning balance     6,772    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         6,772
Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance 0 0 0 0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0 0 0 0 0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Beginning balance   1,265 1,383 1,174  
Provision for credit losses   87   169  
Charge-offs   0   (1)  
Recoveries   0   10  
Ending balance   1,352   1,352  
Individually evaluated for impairment   0   0 0
Collectively evaluated for impairment   1,352   1,352 1,383
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   1,352   1,352 1,383
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Beginning balance   241 265 234  
Provision for credit losses   32   39  
Charge-offs   0   0  
Recoveries   0   0  
Ending balance   273   273  
Individually evaluated for impairment   0   0 0
Collectively evaluated for impairment   273   273 265
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   273   273 265
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]          
Beginning balance   496 526 403  
Provision for credit losses   (66)   27  
Charge-offs   0   0  
Recoveries   0   0  
Ending balance   430   430  
Individually evaluated for impairment   0   0 0
Collectively evaluated for impairment   430   430 526
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   430   430 526
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Beginning balance   1,991 2,031 1,884  
Provision for credit losses   79   186  
Charge-offs   0   0  
Recoveries   0   0  
Ending balance   2,070   2,070  
Individually evaluated for impairment   0   0 0
Collectively evaluated for impairment   2,070   2,070 2,031
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   2,070   2,070 2,031
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Commercial Portfolio Segment [Member]          
Beginning balance   888 1,046 873  
Provision for credit losses   (2)   13  
Charge-offs   0   (9)  
Recoveries   0   9  
Ending balance   886   886  
Individually evaluated for impairment   0   0 155
Collectively evaluated for impairment   886   886 891
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   886   886 1,046
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Beginning balance 2,016        
Provision for credit losses 91   208    
Charge-offs 0   0    
Recoveries 0   0    
Ending balance 2,107   2,107    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2,107   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)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         (130)
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     2,029    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         2,029
Commercial Portfolio Segment [Member] | Commercial Business [Member]          
Beginning balance 1,564        
Provision for credit losses (219)   511    
Charge-offs 0   (188)    
Recoveries 0   8    
Ending balance 1,345   1,345    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 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)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         (142)
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     1,156    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         1,156
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Beginning balance 363 533 530 527  
Provision for credit losses 18 3 (115) 7  
Charge-offs (2) 0 (11) 0  
Recoveries 2 0 2 2  
Ending balance 381 536 381 536  
Individually evaluated for impairment   0   0 0
Collectively evaluated for impairment   536   536 530
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 381 536 381 536 530
Consumer 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)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         (26)
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     531    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         531
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]          
Beginning balance 858   991    
Provision for credit losses 248   (54)    
Charge-offs (59)   (341)    
Recoveries 34   160    
Ending balance 1,081 1,019 1,081 1,019  
Individually evaluated for impairment   0   0 0
Collectively evaluated for impairment   1,019   1,019 991
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,081 1,019 1,081 1,019 991
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Beginning balance     435    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         435
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     881    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         881
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Beginning balance     0    
Ending balance   0   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0   0 0
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]          
Beginning balance   980   988  
Provision for credit losses   42   109  
Charge-offs   (77) (341) (277)  
Recoveries   74   199  
Ending balance   1,019   1,019  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   $ 1,019   $ 1,019  
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Charge-offs     (11)    
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]          
Beginning balance 1,469        
Provision for credit losses 70   96    
Charge-offs 0   (31)    
Recoveries 6   21    
Ending balance 1,545   1,545    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,545   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    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         423
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     1,036    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         1,036
Residential Portfolio Segment [Member] | Multifamily [Member]          
Beginning balance 614        
Provision for credit losses (112)   159    
Charge-offs 0   0    
Recoveries 0   0    
Ending balance 502   502    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 502   502    
Residential Portfolio Segment [Member] | Multifamily [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Beginning balance     (3)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         (3)
Residential Portfolio Segment [Member] | Multifamily [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     346    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         346
Construction [Member]          
Provision for credit losses     47    
Charge-offs     0    
Recoveries     0    
Ending balance 647   647    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 647   647    
Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]          
Beginning balance     13    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         13
Construction [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     587    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         587
Construction [Member] | One-to-four Family Residential Construction [Member]          
Beginning balance 171        
Provision for credit losses 7   (19)    
Charge-offs 0   0    
Recoveries 0   0    
Ending balance 178   178    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 178   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)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         (9)
Construction [Member] | One-to-four Family Residential Construction [Member] | Prior to Adoption of Asc 326 [Member]          
Beginning balance     206    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest         $ 206
Construction [Member] | Other Construction, Development and Land [Member]          
Beginning balance 460        
Provision for credit losses 187        
Charge-offs 0   0    
Recoveries 0        
Ending balance 647   647    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 647   $ 647