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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Allowance for loan losses, beginning balance     $ 3,758 [1] $ 3,636 $ 3,636
Allowance for loan losses, charge- offs     (224)   (1,078)
Allowance for loan losses, recoveries     36   58
Allowance for loan losses, provisions $ 110 $ 465 347 535 1,142
Allowance for loan losses, ending balance 3,917   3,917   3,758 [1]
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 3,917   3,917   3,758
Loans 461,452   461,452   444,195
Loans: individually evaluated for impairment 5,750   5,750   5,317
Loans: collectively evaluated for impairment 455,702   455,702   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      
Allowance for loan losses, provisions     47   31
Allowance for loan losses, ending balance 141   141   94
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 141   141   94
Loans 20,143   20,143   15,221
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 20,143   20,143   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     (116)   288
Allowance for loan losses, ending balance 195   195   311
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 195   195   311
Loans 21,343   21,343   35,601
Loans: individually evaluated for impairment 223   223   181
Loans: collectively evaluated for impairment 21,120   21,120   35,420
Real Estate Portfolio Segment [Member] | Residential [Member]          
Allowance for loan losses, beginning balance     955 866 866
Allowance for loan losses, charge- offs     (103)   (293)
Allowance for loan losses, recoveries     30  
Allowance for loan losses, provisions     126   382
Allowance for loan losses, ending balance 1,008   1,008   955
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 1,008   1,008   955
Loans 134,721   134,721   121,649
Loans: individually evaluated for impairment 623   623   360
Loans: collectively evaluated for impairment 134,098   134,098   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       43
Allowance for loan losses, provisions     134   498
Allowance for loan losses, ending balance 1,737   1,737   1,603
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 1,737   1,737   1,603
Loans 188,677   188,677   173,999
Loans: individually evaluated for impairment 4,301   4,301   4,098
Loans: collectively evaluated for impairment 184,376   184,376   169,901
Commercial Industrial and Agricultural Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     441 461 461
Allowance for loan losses, charge- offs     (35)   (80)
Allowance for loan losses, recoveries     1  
Allowance for loan losses, provisions     50   60
Allowance for loan losses, ending balance 457   457   441
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 457   457   441
Loans 59,591   59,591   61,197
Loans: individually evaluated for impairment 182   182   379
Loans: collectively evaluated for impairment 59,409   59,409   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     2   (101)
Allowance for loan losses, ending balance 239   239   237
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 239   239   237
Loans 29,294   29,294   28,835
Loans: individually evaluated for impairment 421   421   299
Loans: collectively evaluated for impairment 28,873   28,873   28,536
Consumer Portfolio Segment [Member]          
Allowance for loan losses, beginning balance     108 97 97
Allowance for loan losses, charge- offs     (86)   (101)
Allowance for loan losses, recoveries     5   15
Allowance for loan losses, provisions     108   97
Allowance for loan losses, ending balance 135   135   108
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 135   135   108
Loans 7,683   7,683   7,693
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment 7,683   7,683   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     (4)   (113)
Allowance for loan losses, ending balance 5   5   9
Allowance for loan losses: individually evaluated for impairment    
Allowance for loan losses: collectively evaluated for impairment 5   5   9
Loans    
Loans: individually evaluated for impairment    
Loans: collectively evaluated for impairment    
[1] Derived from consolidated audited financial statements.