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Note 4 - Allowance for Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Allowance for loan losses, beginning balance     $ 3,636 [1] $ 3,298 $ 3,298
Allowance for loan losses, charge- offs     (563)   (848)
Allowance for loan losses, recoveries     58   104
Allowance for loan losses, provisions $ 40 $ 111 575 979 1,082
Allowance for loan losses, ending balance 3,706   3,706   3,636 [1]
Allowance for loan losses: individually evaluated for impairment     17
Allowance for loan losses: collectively evaluated for impairment 3,706   3,706   3,619
Loans 434,810   434,810   418,991
Loans: individually evaluated for impairment 4,816   4,816   7,276
Loans: collectively evaluated for impairment 429,994   429,994   411,715
Construction Loan Portfolio Segment [Member] | Residential [Member]          
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     26   (20)
Allowance for loan losses, ending balance 89   89   63
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 89   89   63
Loans 12,278   12,278   10,204
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 12,278   12,278   10,204
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]          
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     50   (12)
Allowance for loan losses, ending balance 223   223   173
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 223   223   173
Loans 33,915   33,915   27,480
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 33,915   33,915   27,480
Real Estate Portfolio Segment [Member] | Residential [Member]          
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     4   (222)
Allowance for loan losses, ending balance 870   870   866
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 870   870   866
Loans 117,114   117,114   111,626
Loans: individually evaluated for impairment 648   648   770
Loans: collectively evaluated for impairment 116,466   116,466   110,856
Real Estate Portfolio Segment [Member] | Commercial [Member]          
Allowance for loan losses, beginning balance     1,516 1,001 1,001
Allowance for loan losses, charge- offs     (436)   (606)
Allowance for loan losses, recoveries     41  
Allowance for loan losses, provisions     565   1,121
Allowance for loan losses, ending balance 1,686   1,686   1,516
Allowance for loan losses: individually evaluated for impairment     17
Allowance for loan losses: collectively evaluated for impairment 1,686   1,686   1,499
Loans 173,713   173,713   172,248
Loans: individually evaluated for impairment 4,141   4,141   6,495
Loans: collectively evaluated for impairment 169,572   169,572   165,753
Commercial Industrial and Agricultural Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     461 531 531
Allowance for loan losses, charge- offs     (68)   (34)
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     92   (36)
Allowance for loan losses, ending balance 485   485   461
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 485   485   461
Loans 61,152   61,152   59,809
Loans: individually evaluated for impairment 27   27   11
Loans: collectively evaluated for impairment 61,125   61,125   59,798
Equity Lines Portfolio Segment [Member]          
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     (93)   150
Allowance for loan losses, ending balance 245   245   338
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 245   245   338
Loans 28,914   28,914   29,956
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 28,914   28,914   29,956
Consumer Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     97 85 85
Allowance for loan losses, charge- offs     (59)   (103)
Allowance for loan losses, recoveries     17   49
Allowance for loan losses, provisions     44   66
Allowance for loan losses, ending balance 99   99   97
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 99   99   97
Loans 7,724   7,724   7,668
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 7,724   7,724   7,668
Unallocated Financing Receivables [Member]          
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     (113)   35
Allowance for loan losses, ending balance 9   9   122
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 9   9   122
Loans    
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment    
[1] Derived from consolidated audited financial statements.