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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Individually evaluated for impairment $ 0   $ 0   $ 7
Collectively evaluated for impairment 6,566   6,566   6,045
Allowance for loan losses 6,566 $ 6,567 6,566 $ 6,567 6,083
Beginning balance 6,394 6,637 6,083 6,625  
Provision for loan losses 175 0 550 75  
Charge-offs (77) (141) (287) (328)  
Recoveries 74 71 220 195  
Ending balance 6,566 6,567 6,566 6,567  
Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   31
Beginning balance     31    
Ending balance 0   0    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 1,352   1,352   1,143
Allowance for loan losses 1,352 1,211 1,352 1,211 1,174
Beginning balance 1,265 1,216 1,174 1,239  
Provision for loan losses 87 20 169 0  
Charge-offs 0 (26) (1) (29)  
Recoveries 0 1 10 1  
Ending balance 1,352 1,211 1,352 1,211  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   31
Beginning balance     31    
Ending balance 0   0    
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 273   273   234
Allowance for loan losses 273 205 273 205 234
Beginning balance 241 215 234 209  
Provision for loan losses 32 (4) 39 5  
Charge-offs 0 (6) 0 (9)  
Recoveries 0 0 0 0  
Ending balance 273 205 273 205  
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   0
Beginning balance     0    
Ending balance 0   0    
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 430   430   403
Allowance for loan losses 430 403 430 403 403
Beginning balance 496 389 403 292  
Provision for loan losses (66) 14 27 111  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance 430 403 430 403  
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   0
Beginning balance     0    
Ending balance 0   0    
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 2,070   2,070   1,884
Allowance for loan losses 2,070 2,317 2,070 2,317 1,884
Beginning balance 1,991 2,357 1,884 2,358  
Provision for loan losses 79 (40) 186 (41)  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Ending balance 2,070 2,317 2,070 2,317  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   0
Beginning balance     0    
Ending balance 0   0    
Commercial Portfolio Segment [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 886   886   873
Allowance for loan losses 886 764 886 764 873
Beginning balance 888 784 873 843  
Provision for loan losses (2) (30) 13 (89)  
Charge-offs 0 0 (9) 0  
Recoveries 0 10 9 10  
Ending balance 886 764 886 764  
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   0
Beginning balance     0    
Ending balance 0   0    
Consumer Portfolio Segment [Member]          
Allowance for loan losses 1,019   1,019   988
Beginning balance 980   988    
Provision for loan losses 42   109    
Charge-offs (77)   (277)    
Recoveries 74   199    
Ending balance 1,019   1,019    
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Individually evaluated for impairment 0   0   7
Collectively evaluated for impairment 536   536   520
Allowance for loan losses 536 645 536 645 527
Beginning balance 533 625 527 617  
Provision for loan losses 3 20 7 37  
Charge-offs 0 0 0 (10)  
Recoveries 0 0 2 1  
Ending balance 536 645 536 645  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   0
Beginning balance     0    
Ending balance 0   0    
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 1,019   1,019   988
Allowance for loan losses 1,019 1,022 1,019 1,022 988
Beginning balance   1,051 988 1,067  
Provision for loan losses   20   52  
Charge-offs   (109)   (280)  
Recoveries   60   183  
Ending balance 1,019 $ 1,022 1,019 $ 1,022  
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 0   0   $ 0
Beginning balance     0    
Ending balance $ 0   $ 0