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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Individually evaluated for impairment         $ 213 $ 52
Collectively evaluated for impairment         3,966 3,580
Allowance for loan losses $ 4,179 $ 3,526 $ 4,179 $ 3,537 4,179 3,634
Beginning balance 3,867 3,526 3,634 3,386    
Provision for loan losses 455 150 968 617    
Charge-offs (195) (206) (617) (694)    
Recoveries 52 67 194 228    
Ending balance 4,179 3,537 4,179 3,537    
Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses     2
Beginning balance     2      
Ending balance        
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Individually evaluated for impairment         160 35
Collectively evaluated for impairment         595 182
Allowance for loan losses 755 212 755 204 755 219
Beginning balance 688 212 219 380    
Provision for loan losses 71 (9) 608 (155)    
Charge-offs (5) (2) (79) (48)    
Recoveries 1 3 7 27    
Ending balance 755 204 755 204    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses     2
Beginning balance     2      
Ending balance        
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         161 133
Allowance for loan losses 161 124 161 126 161 133
Beginning balance 148 124 133 56    
Provision for loan losses 13 2 28 70    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Ending balance 161 126 161 126    
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses    
Beginning balance          
Ending balance        
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         217 245
Allowance for loan losses 217 306 217 261 217 245
Beginning balance 216 306 245 80    
Provision for loan losses 1 (45) (28) 181    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Ending balance 217 261 217 261    
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses    
Beginning balance          
Ending balance        
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         1,317 1,622
Allowance for loan losses 1,317 1,583 1,317 1,591 1,317 1,622
Beginning balance 1,306 1,583 1,622 1,670    
Provision for loan losses 8 (15) (340) (147)    
Charge-offs 0 0 0 (3)    
Recoveries 3 23 35 71    
Ending balance 1,317 1,591 1,317 1,591    
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses    
Beginning balance          
Ending balance        
Commercial Portfolio Segment [Member]            
Individually evaluated for impairment         53 4
Collectively evaluated for impairment         417 287
Allowance for loan losses 470 290 470 235 470 291
Beginning balance 417 290 291 198    
Provision for loan losses 55 (8) 181 123    
Charge-offs (2) (47) (3) (90)    
Recoveries 0 0 1 4    
Ending balance 470 235 470 235    
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses    
Beginning balance          
Ending balance        
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]            
Individually evaluated for impairment         13
Collectively evaluated for impairment         691 697
Allowance for loan losses 691 680 691 740 691 710
Beginning balance 607 680 710 683    
Provision for loan losses 89 58 (19) 59    
Charge-offs (8) 0 (21) (6)    
Recoveries 3 2 21 4    
Ending balance 691 740 691 740    
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]            
Allowance for loan losses    
Beginning balance          
Ending balance        
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]            
Individually evaluated for impairment        
Collectively evaluated for impairment         568 414
Allowance for loan losses 568 331 568 380 568 414
Beginning balance 485 331 414 319    
Provision for loan losses 218 167 538 486    
Charge-offs (180) (157) (514) (547)    
Recoveries 45 39 130 122    
Ending balance 568 $ 380 568 $ 380    
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    
Beginning balance          
Ending balance