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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Individually evaluated for impairment $ 7   $ 7   $ 0
Collectively evaluated for impairment 6,530   6,530   6,594
Allowance for loan losses 6,567 $ 6,404 6,567 $ 6,404 6,625
Beginning balance 6,637 6,064 6,625 5,061  
Provisions for loan losses 0 400 75 1,576  
Charge-offs (141) (112) (328) (448)  
Recoveries 71 52 195 215  
Provision for Loan and Lease Losses, Total 0 400 75 1,576  
Ending balance 6,567 6,404 6,567 6,404  
Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 30   30   31
Beginning balance     31    
Ending balance 30   30    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 1,181   1,181   1,208
Allowance for loan losses 1,211 1,129 1,211 1,129 1,239
Beginning balance 1,216 1,055 1,239 867  
Provisions for loan losses 20 70 0 284  
Charge-offs (26) 0 (29) (72)  
Recoveries 1 4 1 50  
Provision for Loan and Lease Losses, Total 20 70 0 284  
Ending balance 1,211 1,129 1,211 1,129  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]          
Allowance for loan losses 30   30   31
Beginning balance     31    
Ending balance 30   30    
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Individually evaluated for impairment 0   0   0
Collectively evaluated for impairment 205   205   209
Allowance for loan losses 205 207 205 207 209
Beginning balance 215 196 209 163  
Provisions for loan losses (4) 11 5 44  
Charge-offs (6) 0 (9) 0  
Recoveries 0 0 0 0  
Provision for Loan and Lease Losses, Total (4) 11 5 44  
Ending balance 205 207 205 207  
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 403   403   292
Allowance for loan losses 403 373 403 373 292
Beginning balance 389 369 292 350  
Provisions for loan losses 14 4 111 23  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for Loan and Lease Losses, Total 14 4 111 23  
Ending balance 403 373 403 373  
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 2,317   2,317   2,358
Allowance for loan losses 2,317 2,054 2,317 2,054 2,358
Beginning balance 2,357 1,902 2,358 1,623  
Provisions for loan losses (40) 152 (41) 431  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for Loan and Lease Losses, Total (40) 152 (41) 431  
Ending balance 2,317 2,054 2,317 2,054  
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 764   764   843
Allowance for loan losses 764 853 764 853 843
Beginning balance 784 868 843 595  
Provisions for loan losses (30) 17 (89) 290  
Charge-offs 0 (32) 0 (32)  
Recoveries 10 0 10 0  
Provision for Loan and Lease Losses, Total (30) 17 (89) 290  
Ending balance 764 853 764 853  
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] | Home Equity and Second Mortgage [Member]          
Individually evaluated for impairment 7   7   0
Collectively evaluated for impairment 638   638   617
Allowance for loan losses 645 643 645 643 617
Beginning balance 625 604 617 515  
Provisions for loan losses 20 39 37 117  
Charge-offs 0 0 (10) 0  
Recoveries 0 0 1 11  
Provision for Loan and Lease Losses, Total 20 39 37 117  
Ending balance 645 643 645 643  
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] | Other Consumer Loan [Member]          
Allowance for loan losses 1,022 1,145 1,022 1,145 1,067
Beginning balance 1,051 1,070 1,067 948  
Provisions for loan losses 20 107 52 387  
Charge-offs (109) (80) (280) (344)  
Recoveries 60 48 183 154  
Provision for Loan and Lease Losses, Total 20 107 52 387  
Ending balance 1,022 $ 1,145 1,022 $ 1,145  
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 1,022   1,022   1,067
Allowance for loan losses 1,022   1,022   1,067
Beginning balance     1,067    
Ending balance 1,022   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