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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Individually evaluated for impairment         $ 30 $ 48
Collectively evaluated for impairment         4,689 4,017
Allowance for loan losses $ 4,739 $ 3,867 $ 4,739 $ 4,179 4,739 4,065
Beginning balance 4,609 3,867 4,065 3,634    
Provision for loan losses 225 455 975 968    
Charge-offs (160) (195) (593) (617)    
Recoveries 65 52 292 194    
Ending balance 4,739 4,179 4,739 4,179    
Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses 20   20   20  
Ending balance 20   20      
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Individually evaluated for impairment         16 3
Collectively evaluated for impairment         770 690
Allowance for loan losses 806 688 806 755 806 693
Beginning balance 754 688 693 219    
Provision for loan losses 56 71 131 608    
Charge-offs (4) (5) (135) (79)    
Recoveries 1 117 7    
Ending balance 806 755 806 755    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses 20   20   20  
Ending balance 20   20      
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         172 162
Allowance for loan losses 172 148 172 161 172 162
Beginning balance 170 148 162 133    
Provision for loan losses 1 13 9 28    
Charge-offs 0 0    
Recoveries 1 0 1 0    
Ending balance 172 161 172 161    
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses      
Ending balance        
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         351 224
Allowance for loan losses 351 216 351 217 351 224
Beginning balance 316 216 224 245    
Provision for loan losses 35 1 127 (28)    
Charge-offs 0 0    
Recoveries 0 0    
Ending balance 351 217 351 217    
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses      
Ending balance        
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Individually evaluated for impairment         44
Collectively evaluated for impairment         1,482 1,357
Allowance for loan losses 1,482 1,306 1,482 1,317 1,482 1,401
Beginning balance 1,452 1,306 1,401 1,622    
Provision for loan losses 30 8 81 (340)    
Charge-offs 0 0    
Recoveries 3 35    
Ending balance 1,482 1,317 1,482 1,317    
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses      
Ending balance        
Commercial Portfolio Segment [Member]            
Individually evaluated for impairment         1
Collectively evaluated for impairment         552 458
Allowance for loan losses 552 417 552 470 552 459
Beginning balance 596 417 459 291    
Provision for loan losses (48) 55 89 181    
Charge-offs (2) (3)    
Recoveries 4 0 4 1    
Ending balance 552 470 552 470    
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses      
Ending balance        
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Individually evaluated for impairment         14
Collectively evaluated for impairment         473 443
Allowance for loan losses 487 607 487 691 487 443
Beginning balance 472 607 443 710    
Provision for loan losses 14 89 39 (19)    
Charge-offs (8) (2) (21)    
Recoveries 1 3 7 21    
Ending balance 487 691 487 691    
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses      
Ending balance        
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         889 683
Allowance for loan losses 889   889   889 683
Beginning balance     683      
Ending balance 889   889      
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      
Ending balance        
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]            
Allowance for loan losses 849 485 889 568 $ 889 $ 683
Beginning balance 849 485 683 414    
Provision for loan losses 137 218 499 538    
Charge-offs (156) (180) (456) (514)    
Recoveries 59 45 163 130    
Ending balance $ 889 $ 568 $ 889 $ 568