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Note 3 - Loans and Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Dec. 31, 2017
Individually evaluated for impairment     $ 117 $ 52
Collectively evaluated for impairment     3,514 3,580
Allowance for loan losses $ 3,631 $ 3,386 3,631 3,634
Beginning balance 3,634 3,386    
Provision for loan losses 197 211    
Charge-offs (257) (288)    
Recoveries 57 109    
Ending balance 3,631 3,418    
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     101 35
Collectively evaluated for impairment     200 182
Allowance for loan losses 301 380 301 219
Beginning balance 219 380    
Provision for loan losses 139 (85)    
Charge-offs (60) (40)    
Recoveries 3 16    
Ending balance 301 271    
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     156 133
Allowance for loan losses 156 56 156 133
Beginning balance 133 56    
Provision for loan losses 23 53    
Charge-offs    
Recoveries    
Ending balance 156 109    
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     291 245
Allowance for loan losses 291 80 291 245
Beginning balance 245 80    
Provision for loan losses 46 143    
Charge-offs    
Recoveries    
Ending balance 291 223    
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     1,520 1,622
Allowance for loan losses 1,520 1,670 1,520 1,622
Beginning balance 1,622 1,670    
Provision for loan losses (110) (128)    
Charge-offs (1)    
Recoveries 8 44    
Ending balance 1,520 1,585    
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     3 4
Collectively evaluated for impairment     273 287
Allowance for loan losses 276 198 276 291
Beginning balance 291 198    
Provision for loan losses (15) 85    
Charge-offs (1) (43)    
Recoveries 1 4    
Ending balance 276 244    
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 13
Collectively evaluated for impairment     667 697
Allowance for loan losses 680 683 680 710
Beginning balance 710 683    
Provision for loan losses (33) 14    
Charge-offs    
Recoveries 3 1    
Ending balance 680 698    
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] | Other Consumer Loan [Member]        
Individually evaluated for impairment    
Collectively evaluated for impairment     407 414
Allowance for loan losses 407 319 407 414
Beginning balance 414 319    
Provision for loan losses 147 129    
Charge-offs (196) (204)    
Recoveries 42 44    
Ending balance 407 $ 288    
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] | Financial Asset Acquired with Credit Deterioration [Member]        
Allowance for loan losses  
Beginning balance      
Ending balance