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Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2023
Balance $ 6,772 $ 6,083  
Provision for credit losses 193 175  
Charge-offs (275) (74)  
Recoveries 72 61  
Balance 7,323 6,245  
Individually evaluated for impairment   6 $ 155
Collectively evaluated for impairment   6,208 6,617
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 7,323 6,245 6,772
Financial Asset Acquired with Credit Deterioration [Member]      
Balance 0    
Balance 0 31  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0 31 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance 561    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Balance   1,174  
Provision for credit losses   49  
Charge-offs   0  
Recoveries   5  
Balance   1,228  
Individually evaluated for impairment   1 0
Collectively evaluated for impairment   1,196 1,383
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   1,228 1,383
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   31  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   31 0
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Balance   234  
Provision for credit losses   1  
Charge-offs   0  
Recoveries   0  
Balance   235  
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   235 265
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   235 265
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0 0
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Balance   403  
Provision for credit losses   (16)  
Charge-offs   0  
Recoveries   0  
Balance   387  
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   387 526
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   387 526
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0 0
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Balance   1,884  
Provision for credit losses   43  
Charge-offs   0  
Recoveries   0  
Balance   1,927  
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   1,927 2,031
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   1,927 2,031
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0 0
Commercial Portfolio Segment [Member]      
Balance   873  
Provision for credit losses   121  
Charge-offs   0  
Recoveries   0  
Balance   994  
Individually evaluated for impairment   0 155
Collectively evaluated for impairment   994 891
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   994 1,046
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Balance 2,029    
Provision for credit losses 291    
Charge-offs 0    
Recoveries 0    
Balance 2,190    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2,190    
Commercial Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance (130)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Commercial Portfolio Segment [Member] | Commercial Business [Member]      
Balance 1,156    
Provision for credit losses 220    
Charge-offs (155)    
Recoveries 5    
Balance 1,084    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,084    
Commercial Portfolio Segment [Member] | Commercial Business [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance (142)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Consumer Portfolio Segment [Member]      
Balance   988  
Provision for credit losses   (13)  
Charge-offs   (74)  
Recoveries   56  
Balance   957  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   957  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Balance 531 527  
Provision for credit losses (139) (10)  
Charge-offs 0 0  
Recoveries 0 0  
Balance 366 517  
Individually evaluated for impairment   5 0
Collectively evaluated for impairment   512 530
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 366 517 530
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   0 0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance (26)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Balance 881    
Provision for credit losses (53)    
Charge-offs (118)    
Recoveries 67    
Balance 1,212 957  
Individually evaluated for impairment   0 0
Collectively evaluated for impairment   957 991
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,212 957 991
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]      
Balance   0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest   $ 0 $ 0
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]      
Balance 435    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Residential Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Charge-offs 0    
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]      
Balance 1,036    
Provision for credit losses (43)    
Charge-offs (2)    
Recoveries 0    
Balance 1,414    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,414    
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance 423    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Residential Portfolio Segment [Member] | Multifamily [Member]      
Balance 346    
Provision for credit losses 38    
Charge-offs 0    
Recoveries 0    
Balance 381    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 381    
Residential Portfolio Segment [Member] | Multifamily [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance (3)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Construction [Member] | One-to-four Family Residential Construction [Member]      
Balance 206    
Provision for credit losses (10)    
Charge-offs 0    
Recoveries 0    
Balance 187    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 187    
Construction [Member] | One-to-four Family Residential Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance (9)    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest      
Construction [Member] | Other Construction, Development and Land [Member]      
Balance 587    
Provision for credit losses (111)    
Charge-offs 0    
Recoveries 0    
Balance 489    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 489    
Construction [Member] | Other Construction, Development and Land [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]      
Balance $ 13    
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest