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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Individually evaluated for impairment         $ 162 $ 52
Collectively evaluated for impairment         3,705 3,580
Allowance for loan losses $ 3,867 $ 3,418 $ 3,867 $ 3,526 3,867 3,634
Beginning balance 3,631 3,418 3,634 3,386    
Provision for loan losses 316 256 513 467    
Charge-offs (166) (200) (422) (488)    
Recoveries 86 52 142 161    
Ending balance 3,867 3,526 3,867 3,526    
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         528 182
Allowance for loan losses 688 271 688 212 688 219
Beginning balance 301 271 219 380    
Provision for loan losses 398 (61) 538 (146)    
Charge-offs (15) (6) (75) (46)    
Recoveries 4 8 6 24    
Ending balance 688 212 688 212    
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         148 133
Allowance for loan losses 148 109 148 124 148 133
Beginning balance 156 109 133 56    
Provision for loan losses (8) 15 15 68    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Ending balance 148 124 148 124    
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         216 245
Allowance for loan losses 216 223 216 306 216 245
Beginning balance 291 223 245 80    
Provision for loan losses (75) 83 (29) 226    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Ending balance 216 306 216 306    
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         1,306 1,622
Allowance for loan losses 1,306 1,585 1,306 1,583 1,306 1,622
Beginning balance 1,520 1,585 1,622 1,670    
Provision for loan losses (237) (4) (348) (132)    
Charge-offs 0 (2) 0 (3)    
Recoveries 23 4 32 48    
Ending balance 1,306 1,583 1,306 1,583    
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         2 4
Collectively evaluated for impairment         415 287
Allowance for loan losses 417 244 417 290 417 291
Beginning balance 276 244 291 198    
Provision for loan losses 141 46 126 131    
Charge-offs 0 0 (1) (43)    
Recoveries 0 0 1 4    
Ending balance 417 290 417 290    
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         607 697
Allowance for loan losses 607 698 607 680 607 710
Beginning balance 680 698 710 683    
Provision for loan losses (75) (13) (109) 1    
Charge-offs (13) (6) (12) (6)    
Recoveries 15 1 18 2    
Ending balance 607 680 607 680    
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         485 414
Allowance for loan losses 485 288 485 331 485 414
Beginning balance 407 288 414 319    
Provision for loan losses 172 190 320 319    
Charge-offs (138) (186) (334) (390)    
Recoveries 44 39 85 83    
Ending balance 485 $ 331 485 $ 331    
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