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Note 4 - Loans and Related Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
   
2016
    
2015
  
                 
Commercial and industrial
   $
60,630
    $
42,536
 
Real estate - construction
    
23,709
     
22,137
 
Real estate - mortgage:
                
Residential
    
270,830
     
232,478
 
Commercial
    
249,490
     
231,701
 
Consumer installment
    
4,481
     
4,858
 
     
609,140
     
533,710
 
Less allowance for loan and lease losses
    
(6,598
 )    
(6,385
 )
                 
Net loans
   $
602,542
    $
527,325
 
Schedule Of Financing Receivable By Segment [Table Text Block]
                   
Real Estate- Mortgage
                  
December 31, 2016
  
Commercial and
industrial
    
Real estate-
construction
    
Residential
    
Commercial
    
Consumer
installment
    
Total
  
Loans:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated for impairment
   $
1,190
    $
913
    $
3,135
    $
7,187
    $
5
    $
12,430
 
Collectively evaluated for impairment
    
59,440
     
22,796
     
267,695
     
242,303
     
4,476
     
596,710
 
Total loans
   $
60,630
    $
23,709
    $
270,830
    $
249,490
    $
4,481
    $
609,140
 
                   
Real estate- Mortgage
                  
December 31, 2015
  
Commercial and
industrial
    
Real estate-
construction
    
Residential
    
Commercial
    
Consumer
installment
    
Total
  
Loans:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Individually evaluated for impairment
   $
1,808
    $
1,787
    $
3,881
    $
6,199
    $
6
    $
13,681
 
Collectively evaluated for impairment
    
40,728
     
20,350
     
228,597
     
225,502
     
4,852
     
520,029
 
Total loans
   $
42,536
    $
22,137
    $
232,478
    $
231,701
    $
4,858
    $
533,710
 
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
                   
Real Estate- Mortgage
                  
December 31, 2016
  
Commercial and
industrial
    
Real estate-
construction
    
Residential
    
Commercial
    
Consumer
installment
    
Total
  
Allowance for loan and lease losses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ending allowance balance attributable to loans:
                                                
Individually evaluated for impairment
   $
90
    $
-
    $
251
    $
186
    $
-
    $
527
 
Collectively evaluated for impairment
    
358
     
172
     
2,567
     
2,949
     
25
     
6,071
 
Total ending allowance balance
   $
448
    $
172
    $
2,818
    $
3,135
    $
25
    $
6,598
 
                   
Real Estate- Mortgage
                  
December 31, 2015
  
Commercial and
industrial
    
Real estate-
construction
    
Residential
    
Commercial
    
Consumer
installment
    
Total
  
Allowance for loan and lease losses:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Ending allowance balance attributable to loans:
                                                
Individually evaluated for impairment
   $
388
    $
130
    $
276
    $
39
    $
-
    $
833
 
Collectively evaluated for impairment
    
479
     
146
     
2,863
     
2,039
     
25
     
5,552
 
Total ending allowance balance
   $
867
    $
276
    $
3,139
    $
2,078
    $
25
    $
6,385
 
   
Commercial and
industrial
    
Real estate-
construction
    
Real estate-
residential
mortgage
    
Real estate-
commercial
mortgage
    
Consumer
installment
    
Total
  
ALLL balance at December 31, 2015
   $
867
    $
276
    $
3,139
    $
2,078
    $
25
    $
6,385
 
Charge-offs
    
(237
 )    
-
     
(414
 )    
(70
 )    
(22
 )    
(743
 )
Recoveries
    
90
     
-
     
141
     
140
     
15
     
386
 
Provision
    
(272
 )    
(104
 )    
(48
 )    
987
     
7
     
570
 
ALLL balance at December 31, 2016
   $
448
    $
172
    $
2,818
    $
3,135
    $
25
    $
6,598
 
   
Commercial and
industrial
    
Real estate-
construction
    
Real estate-
residential
mortgage
    
Real estate-
commercial
mortgage
    
Consumer
installment
    
Total
  
ALLL balance at December 31, 2014
   $
642
    $
868
    $
3,703
    $
1,576
    $
57
    $
6,846
 
Charge-offs
    
(280
 )    
(385
 )    
(425
 )    
(92
 )    
(15
 )    
(1,197
 )
Recoveries
    
207
     
-
     
186
     
5
     
23
     
421
 
Provision
    
298
     
(207
 )    
(325
 )    
589
     
(40
 )    
315
 
ALLL balance at December 31, 2015
   $
867
    $
276
    $
3,139
    $
2,078
    $
25
    $
6,385
 
Impaired Financing Receivables [Table Text Block]
December 31, 2016  
Impaired Loans   
                   
   
Recorded
     Unpaid Principal    
Related
  
   
Investment
     Balance    
Allowance
  
With no related allowance recorded:
                        
Commercial and industrial
   $
319
    $
318
    $
-
 
Real estate - construction
    
913
     
909
     
-
 
Real estate - mortgage:
                        
Residential
    
2,142
     
2,140
     
-
 
Commercial
    
2,031
     
2,027
     
-
 
Total
   $
5,405
    $
5,394
    $
-
 
                         
With an allowance recorded:
                        
Commercial and industrial
   $
871
     
868
    $
90
 
Real estate - construction
    
-
     
-
     
-
 
Real estate - mortgage:
                        
Residential
    
993
     
991
     
251
 
Commercial
    
5,156
     
5,147
     
186
 
Consumer installment
    
5
     
5
     
-
 
Total
   $
7,025
    $
7,011
    $
527
 
                         
Total:
                        
Commercial and industrial
   $
1,190
    $
1,186
    $
90
 
Real estate - construction
    
913
     
909
     
-
 
Real estate - mortgage:
                        
Residential
    
3,135
     
3,131
     
251
 
Commercial
    
7,187
     
7,174
     
186
 
Consumer installment
    
5
     
5
     
-
 
Total
   $
12,430
    $
12,405
    $
527
 
December 31, 2015
  
Impaired Loans
 
                         
   
Recorded
     Unpaid Principal     
Related
  
   
Investment
     Balance    
Allowance
  
With no related allowance recorded:
                        
Commercial and industrial
   $
1,027
    $
1,025
    $
-
 
Real estate - construction
    
1,657
     
1,651
     
-
 
Real estate - mortgage:
                        
Residential
    
2,445
     
2,443
     
-
 
Commercial
    
2,337
     
2,335
     
-
 
Consumer installment
    
-
     
-
     
-
 
Total
   $
7,466
    $
7,454
    $
-
 
                         
With an allowance recorded:
                        
Commercial and industrial
   $
781
    $
781
    $
388
 
Real estate - construction
    
130
     
130
     
130
 
Real estate - mortgage:
                        
Residential
    
1,436
     
1,436
     
276
 
Commercial
    
3,862
     
3,846
     
39
 
Consumer installment
    
6
     
6
     
-
 
Total
   $
6,215
    $
6,199
    $
833
 
                         
Total:
                        
Commercial and industrial
   $
1,808
    $
1,806
    $
388
 
Real estate - construction
    
1,787
     
1,781
     
130
 
Real estate - mortgage:
                        
Residential
    
3,881
     
3,879
     
276
 
Commercial
    
6,199
     
6,181
     
39
 
Consumer installment
    
6
     
6
     
-
 
Total
   $
13,681
    $
13,653
    $
833
 
Schedule of Additional Information Related to Impaired Loans [Table Text Block]
   
As of December 31, 2016
    
As of December 31, 2015
    
As of December 31, 2014
  
                                                 
   
Average
Recorded
Investment
    
Interest
Income
Recognized
    
Average
Recorded
Investment
    
Interest
Income
Recognized
    
Average
Recorded
Investment
    
Interest
Income
Recognized
  
                                                 
Commercial and industrial
   $
1,211
    $
35
    $
1,468
    $
100
    $
1,989
    $
85
 
Real estate - construction
    
1,281
     
62
     
2,407
     
115
     
3,631
     
154
 
Real estate - mortgage:
                                                
Residential
    
3,529
     
178
     
4,356
     
160
     
5,331
     
171
 
Commercial
    
7,384
     
553
     
5,203
     
350
     
5,998
     
229
 
Consumer installment
    
6
     
11
      
6
     
-
     
11
     
1
 
Total
  $
13,410
    $
839
     $
13,440
    $
725
    $
16,960
    $
640
 
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
   
December 31, 2016
  
   
Number of Contracts
    
Pre-Modification
    
Post-Modification
 
 
  
Term
                    Outstanding Recorded     Outstanding Recorded  
Troubled Debt Restructurings   Modification    
Other
    
Total
     Investment     Investment  
Commercial and industrial
    
5
      
-
     
5
    $
610
    $
610
 
Residential real estate
    
4
      
-
     
4
     
166
     
166
 
Commercial real estate
    
1
      
-
     
1
     
311
     
311
 
   
December 31, 2015
  
   
Number of Contracts
    
Pre-Modification
    
Post-Modification
 
 
  
Term
                     Outstanding Recorded     Outstanding Recorded  
Troubled Debt Restructurings   Modification    
Other
    
Total
     Investment     Investment  
Commercial and industrial
    
6
      
-
     
6
    $
434
    $
434
 
Real estate construction
    
1
      
-
     
1
     
181
     
181
 
Residential real estate
    
5
      
1
     
6
     
515
     
535
 
Commercial real estate
    
1
      
-
     
1
     
270
     
270
 
   
December 31, 2014
  
   
Number of Contracts
    
Pre-Modification
   
Post-Modification
 
 
  
Term
                    Outstanding Recorded     Outstanding Recorded  
Troubled Debt Restructurings   Modification    
Other
    
Total
     Investment     Investment  
Residential real estate
    
3
      
-
     
3
    $
140
    $
140
 
Commercial real estate
    
1
      
-
     
1
     
48
     
48
 
Consumer
    
1
      
-
     
1
     
6
     
6
 
Financing Receivable Credit Quality Indicators [Table Text Block]
           
Special
                    
Total
  
   
Pass
    
Mention
    
Substandard
    
Doubtful
    
Loans
  
December 31, 2016                                        
                                         
Commercial and industrial
   $
58,539
    $
663
    $
1,428
    $
-
    $
60,630
 
Real estate - construction
    
23,541
     
144
     
24
     
-
     
23,709
 
Real estate - mortgage:
                                        
Residential
    
264,481
     
428
     
5,921
     
-
     
270,830
 
Commercial
    
240,678
     
4,422
     
4,390
     
-
     
249,490
 
Consumer installment
    
4,467
     
-
     
14
     
-
     
4,481
 
Total
   $
591,706
    $
5,657
    $
11,777
    $
-
    $
609,140
 
           
Special
                    
Total
  
   
Pass
    
Mention
    
Substandard
    
Doubtful
    
Loans
  
December 31, 2015                                        
                                         
Commercial and industrial
   $
40,560
    $
242
    $
1,734
    $
-
    $
42,536
 
Real estate - construction
    
22,007
     
-
     
-
     
130
     
22,137
 
Real estate - mortgage:
                                        
Residential
    
225,945
     
728
     
5,805
     
-
     
232,478
 
Commercial
    
219,331
     
4,327
     
8,043
     
-
     
231,701
 
Consumer installment
    
4,854
     
-
     
4
     
-
     
4,858
 
Total
   $
512,697
    $
5,297
    $
15,586
    $
130
    $
533,710
 
Past Due Financing Receivables [Table Text Block]
           
30-59 Days
    
60-89 Days
    
90 Days+
    
Total
    
Total
  
   
Current
    
Past Due
    
Past Due
    
Past Due
    
Past Due
    
Loans
  
December 31, 2016                                                
                                                 
Commercial and industrial
   $
60,407
    $
17
    $
2
    $
204
    $
223
    $
60,630
 
Real estate - construction
    
23,709
     
-
     
-
     
-
     
-
     
23,709
 
Real estate - mortgage:
                                                
Residential
    
268,041
     
1,909
     
207
     
673
     
2,789
     
270,830
 
Commercial
    
249,081
     
92
     
-
     
317
     
409
     
249,490
 
Consumer installment
    
4,465
     
-
     
10
     
6
     
16
     
4,481
 
Total
   $
605,703
    $
2,018
    $
219
    $
1,200
    $
3,437
    $
609,140
 
           
30-59 Days
    
60-89 Days
    
90 Days+
    
Total
    
Total
  
   
Current
    
Past Due
    
Past Due
    
Past Due
    
Past Due
    
Loans
  
December 31, 2015                                                
                                                 
Commercial and industrial
   $
41,544
    $
225
    $
26
    $
741
    $
992
    $
42,536
 
Real estate - construction
    
22,137
     
-
     
-
     
-
     
-
     
22,137
 
Real estate - mortgage:
                                                
Residential
    
229,725
     
1,482
     
92
     
1,179
     
2,753
     
232,478
 
Commercial
    
230,903
     
189
     
-
     
609
     
798
     
231,701
 
Consumer installment
    
4,837
     
16
     
3
     
2
     
21
     
4,858
 
Total
   $
529,146
    $
1,912
    $
121
    $
2,531
    $
4,564
    $
533,710
 
Schedule of Financing Receivables, Non Accrual Status [Table Text Block]
           
90+ Days Past
 
   
Nonaccrual
       Due and Accruing  
December 31, 2016                
                 
Commercial and industrial
   $
454
    $
-
 
Real estate - construction
    
-
     
-
 
Real estate - mortgage:
                
Residential
    
4,034
     
-
 
Commercial
    
1,409
     
-
 
Consumer installment
    
6
     
-
 
Total
   $
5,903
    $
0
 
           
90+ Days Past
  
   
Nonaccrual
       Due and Accruing  
December 31, 2015                
                 
Commercial and industrial
   $
1,450
    $
-
 
Real estate - construction
    
130
     
-
 
Real estate - mortgage:
                
Residential
    
4,122
     
-
 
Commercial
    
1,842
     
-
 
Consumer installment
    
1
     
2
 
Total
   $
7,545
    $
2
 
Subsequently Defaulted [Member]  
Notes Tables  
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
   
December 31, 2016
  
 
  
Number of
    
Recorded
  
Troubled Debt Restructurings subsequently defaulted
   Contracts     Investment  
Commercial and industrial
    
2
     $
7
 
Real estate construction
    
1
      
-
 
Residential real estate
    
4
      
278
 
Commercial real estate
    
1
      
119
 
   
December 31, 2015
  
 
  
Number of
   
Recorded
 
Troubled Debt Restructurings subsequently defaulted
   Contracts     Investment  
Commercial and industrial
    
2
     $
14
 
Real estate construction
    
1
      
130
 
   
December 31, 2014
  
 
  
Number of
   
Recorded
 
 Troubled Debt Restructurings subsequently defaulted
   Contracts     Investment  
Residential real estate
    
1
     $
15