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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allowance for loan losses, beginning balance     $ 3,758 [1] $ 3,636 $ 3,636
Allowance for loan losses, charge- offs     (247)   (1,078)
Allowance for loan losses, recoveries     65   58
Allowance for loan losses, provisions $ 24 $ 40 371 575 1,142
Allowance for loan losses, ending balance 3,947   3,947   3,758 [1]
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 3,947   3,947   3,758
Loans 466,343   466,343   444,195
Loans: individually evaluated for impairment 5,452   5,452   5,317
Loans: collectively evaluated for impairment 460,891   460,891   438,878
Construction Loan Portfolio Segment [Member] | Residential [Member]          
Allowance for loan losses, beginning balance     94 63 63
Allowance for loan losses, charge- offs      
Allowance for loan losses, recoveries     10  
Allowance for loan losses, provisions     7   31
Allowance for loan losses, ending balance 111   111   94
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 111   111   94
Loans 19,062   19,062   15,221
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 19,062   19,062   15,221
Construction Loan Portfolio Segment [Member] | Land Acquisition Development And Commercial [Member]          
Allowance for loan losses, beginning balance     311 173 173
Allowance for loan losses, charge- offs       (150)
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     (97)   288
Allowance for loan losses, ending balance 214   214   311
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 214   214   311
Loans 26,048   26,048   35,601
Loans: individually evaluated for impairment 43   43   181
Loans: collectively evaluated for impairment 26,005   26,005   35,420
Real Estate Portfolio Segment [Member] | Residential [Member]          
Allowance for loan losses, beginning balance     955 866 866
Allowance for loan losses, charge- offs     (96)   (293)
Allowance for loan losses, recoveries     30  
Allowance for loan losses, provisions     200   382
Allowance for loan losses, ending balance 1,089   1,089   955
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 1,089   1,089   955
Loans 141,728   141,728   121,649
Loans: individually evaluated for impairment 667   667   360
Loans: collectively evaluated for impairment 141,061   141,061   121,289
Real Estate Portfolio Segment [Member] | Commercial [Member]          
Allowance for loan losses, beginning balance     1,603 1,516 1,516
Allowance for loan losses, charge- offs       (454)
Allowance for loan losses, recoveries     1   43
Allowance for loan losses, provisions     147   498
Allowance for loan losses, ending balance 1,751   1,751   1,603
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 1,751   1,751   1,603
Loans 187,894   187,894   173,999
Loans: individually evaluated for impairment 4,264   4,264   4,098
Loans: collectively evaluated for impairment 183,630   183,630   169,901
Commercial Industrial and Agricultural Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     441 461 461
Allowance for loan losses, charge- offs     (37)   (80)
Allowance for loan losses, recoveries     2  
Allowance for loan losses, provisions     (11)   60
Allowance for loan losses, ending balance 395   395   441
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 395   395   441
Loans 54,933   54,933   61,197
Loans: individually evaluated for impairment 180   180   379
Loans: collectively evaluated for impairment 54,753   54,753   60,818
Equity Lines Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     237 338 338
Allowance for loan losses, charge- offs      
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     (27)   (101)
Allowance for loan losses, ending balance 210   210   237
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 210   210   237
Loans 28,675   28,675   28,835
Loans: individually evaluated for impairment 298   298   299
Loans: collectively evaluated for impairment 28,377   28,377   28,536
Consumer Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     108 97 97
Allowance for loan losses, charge- offs     (114)   (101)
Allowance for loan losses, recoveries     22   15
Allowance for loan losses, provisions     98   97
Allowance for loan losses, ending balance 114   114   108
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 114   114   108
Loans 8,003   8,003   7,693
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 8,003   8,003   7,693
Unallocated Financing Receivables [Member]          
Allowance for loan losses, beginning balance     9 $ 122 122
Allowance for loan losses, charge- offs      
Allowance for loan losses, recoveries      
Allowance for loan losses, provisions     54   (113)
Allowance for loan losses, ending balance 63   63   9
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 63   63   9
Loans    
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment    
[1] Derived from consolidated audited financial statements.