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Note 4 - Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Allowance for loan losses: collectively evaluated for impairment $ 3,683   $ 3,683   $ 3,619
Loans 434,501   434,501   418,991
Loans: individually evaluated for impairment 7,495   7,495   7,276
Loans: collectively evaluated for impairment 427,006   427,006   411,715
Allowance for loan losses, beginning balance     3,636 [1] $ 3,298 3,298
Allowance for loan losses, charge- offs     (526)   (848)
Allowance for loan losses, recoveries     55   104
Allowance for loan losses, provisions 465 $ 808 535 868 1,082
Allowance for loan losses, ending balance 3,700   3,700   3,636 [1]
Allowance for loan losses: individually evaluated for impairment 17   17   17
Construction Loan Portfolio Segment [Member] | Residential [Member]          
Allowance for loan losses: collectively evaluated for impairment 61   61   63
Loans 9,990   9,990   10,204
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 9,990   9,990   10,204
Allowance for loan losses, beginning balance     63 83 83
Allowance for loan losses, charge- offs      
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     (2)   (20)
Allowance for loan losses, ending balance 61   61   63
Allowance for loan losses: individually evaluated for impairment    
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]          
Allowance for loan losses: collectively evaluated for impairment 204   204   173
Loans 31,778   31,778   27,480
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 31,778   31,778   27,480
Allowance for loan losses, beginning balance     173 187 187
Allowance for loan losses, charge- offs       (2)
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     31   (12)
Allowance for loan losses, ending balance 204   204   173
Allowance for loan losses: individually evaluated for impairment    
Real Estate Portfolio Segment [Member] | Residential [Member]          
Allowance for loan losses: collectively evaluated for impairment 815   815   866
Loans 113,434   113,434   111,626
Loans: individually evaluated for impairment 767   767   770
Loans: collectively evaluated for impairment 112,667   112,667   110,856
Allowance for loan losses, beginning balance     866 1,047 1,047
Allowance for loan losses, charge- offs       (4)
Allowance for loan losses, recoveries       45
Allowance for loan losses, provisions     (51)   (222)
Allowance for loan losses, ending balance 815   815   866
Allowance for loan losses: individually evaluated for impairment    
Real Estate Portfolio Segment [Member] | Commercial [Member]          
Allowance for loan losses: collectively evaluated for impairment 1,722   1,722   1,499
Loans 180,121   180,121   172,248
Loans: individually evaluated for impairment 6,701   6,701   6,495
Loans: collectively evaluated for impairment 173,420   173,420   165,753
Allowance for loan losses, beginning balance     1,516 1,001 1,001
Allowance for loan losses, charge- offs     (430)   (606)
Allowance for loan losses, recoveries     38  
Allowance for loan losses, provisions     615   1,121
Allowance for loan losses, ending balance 1,739   1,739   1,516
Allowance for loan losses: individually evaluated for impairment 17   17   17
Commercial Industrial and Agricultural Portfolio Segment [Member]          
Allowance for loan losses: collectively evaluated for impairment 473   473   461
Loans 61,459   61,459   59,809
Loans: individually evaluated for impairment 27   27   11
Loans: collectively evaluated for impairment 61,432   61,432   59,798
Allowance for loan losses, beginning balance     461 531 531
Allowance for loan losses, charge- offs     (57)   (34)
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     69   (36)
Allowance for loan losses, ending balance 473   473   461
Allowance for loan losses: individually evaluated for impairment    
Equity Lines Portfolio Segment [Member]          
Allowance for loan losses: collectively evaluated for impairment 281   281   338
Loans 30,519   30,519   29,956
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 30,519   30,519   29,956
Allowance for loan losses, beginning balance     338 277 277
Allowance for loan losses, charge- offs       (99)
Allowance for loan losses, recoveries       10
Allowance for loan losses, provisions     (57)   150
Allowance for loan losses, ending balance 281   281   338
Allowance for loan losses: individually evaluated for impairment    
Consumer Portfolio Segment [Member]          
Allowance for loan losses: collectively evaluated for impairment 97   97   97
Loans 7,200   7,200   7,668
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 7,200   7,200   7,668
Allowance for loan losses, beginning balance     97 85 85
Allowance for loan losses, charge- offs     (39)   (103)
Allowance for loan losses, recoveries     17   49
Allowance for loan losses, provisions     22   66
Allowance for loan losses, ending balance 97   97   97
Allowance for loan losses: individually evaluated for impairment    
Unallocated Financing Receivables [Member]          
Allowance for loan losses: collectively evaluated for impairment 30   30   122
Loans    
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment    
Allowance for loan losses, beginning balance     122 $ 87 87
Allowance for loan losses, charge- offs      
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     (92)   35
Allowance for loan losses, ending balance 30   30   122
Allowance for loan losses: individually evaluated for impairment    
[1] Derived from consolidated audited financial statements.