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Note 4 - Allowance for Loan Losses (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   
September 30, 2019
  
   
Construction and Land Development
    
Secured by 1-4 Family Residential
    
Other Real Estate
    
Commercial and Industrial
    
Consumer and Other Loans
    
Total
  
Allowance for loan losses:
      
 
      
 
      
 
      
 
      
 
      
 
Beginning Balance, December 31, 2018   $
561
     $
895
     $
2,160
     $
464
     $
929
     $
5,009
  
Charge-offs    
—
      
(58
 )    
—
      
(2
 )    
(543
 )    
(603
 )
Recoveries    
50
      
8
      
—
      
6
      
242
      
306
  
Provision for (recovery of) loan losses    
(119
 )    
(71
 )    
166
      
98
      
126
      
200
  
Ending Balance, September 30, 2019
   $
492
     $
774
     $
2,326
     $
566
     $
754
     $
4,912
  
Ending Balance:
                                                
Individually evaluated for impairment    
31
      
16
      
27
      
—
      
—
      
74
  
Collectively evaluated for impairment    
461
      
758
      
2,299
      
566
      
754
      
4,838
  
Loans:
      
 
      
 
      
 
      
 
      
 
      
 
Ending Balance
   $
45,193
     $
226,828
     $
233,067
     $
50,557
     $
15,608
     $
571,253
  
Individually evaluated for impairment    
376
      
690
      
500
      
—
      
—
      
1,566
  
Collectively evaluated for impairment    
44,817
      
226,138
      
232,567
      
50,557
      
15,608
      
569,687
  
   
December 31, 2018
  
   
Construction and Land Development
    
Secured by 1-4 Family Residential
    
Other Real Estate
    
Commercial and Industrial
    
Consumer and Other Loans
    
Total
  
Allowance for loan losses:
      
 
      
 
      
 
      
 
      
 
      
 
Beginning Balance, At December 31, 2017
   $
414
     $
775
     $
2,948
     $
418
     $
771
     $
5,326
  
Charge-offs
    
—
      
(55
 )    
—
      
(10
 )    
(1,104
 )    
(1,169
 )
Recoveries
    
—
      
13
      
5
      
8
      
226
      
252
  
Provision for (recovery of) loan losses
    
147
      
162
      
(793
 )    
48
      
1,036
      
600
  
Ending Balance, December 31, 2018
   $
561
     $
895
     $
2,160
     $
464
     $
929
     $
5,009
  
Ending Balance:
                                                
Individually evaluated for impairment
    
71
      
172
      
—
      
—
      
—
      
243
  
Collectively evaluated for impairment
    
490
      
723
      
2,160
      
464
      
929
      
4,766
  
Loans:
      
 
      
 
      
 
      
 
      
 
      
 
Ending Balance
   $
45,867
     $
215,945
     $
219,553
     $
44,605
     $
16,886
     $
542,856
  
Individually evaluated for impairment
    
327
      
663
      
2,249
      
197
      
—
      
3,436
  
Collectively evaluated for impairment
    
45,540
      
215,282
      
217,304
      
44,408
      
16,886
      
539,420
  
   
September 30, 2018
  
   
Construction and Land Development
    
Secured by 1-4 Family Residential
    
Other Real Estate
    
Commercial and Industrial
    
Consumer and Other Loans
    
Total
  
Allowance for loan losses:
      
 
      
 
      
 
      
 
      
 
      
 
Beginning Balance, At December 31, 2017
   $
414
     $
775
     $
2,948
     $
418
     $
771
     $
5,326
  
Charge-offs
    
—
      
(56
 )    
—
      
(8
 )    
(731
 )    
(795
 )
Recoveries
    
—
      
11
      
1
      
6
      
152
      
170
  
Provision for (recovery of) loan losses
    
128
      
(5
 )    
(677
 )    
26
      
628
      
100
  
Ending Balance, September 30, 2018
   $
542
     $
725
     $
2,272
     $
442
     $
820
     $
4,801
  
Ending Balance:
                                                
Individually evaluated for impairment
    
87
      
20
      
—
      
—
      
—
      
107
  
Collectively evaluated for impairment
    
455
      
705
      
2,272
      
442
      
820
      
4,694
  
Loans:
      
 
      
 
      
 
      
 
      
 
      
 
Ending Balance
   $
42,982
     $
211,938
     $
224,903
     $
42,861
     $
17,137
     $
539,821
  
Individually evaluated for impairment
    
343
      
438
      
2,029
      
197
      
—
      
3,007
  
Collectively evaluated for impairment
    
42,639
      
211,500
      
222,874
      
42,664
      
17,137
      
536,814
  
Impaired Financing Receivables [Table Text Block]
   
September 30, 2019
  
   
Unpaid Principal Balance
    
Recorded Investment with No Allowance
    
Recorded Investment with Allowance
    
Total Recorded Investment
    
Related Allowance
    
Average Recorded Investment
    
Interest Income Recognized
  
Real estate loans:
                                                        
Construction and land development   $
403
     $
—
     $
376
     $
376
     $
31
     $
368
     $
1
  
Secured by 1-4 family    
781
      
543
      
147
      
690
      
16
      
800
      
1
  
Other real estate loans    
515
      
473
      
27
      
500
      
27
      
858
      
3
  
Commercial and industrial    
—
      
—
      
—
      
—
      
—
      
30
      
—
  
Total
   $
1,699
     $
1,016
     $
550
     $
1,566
     $
74
     $
2,056
     $
5
  
   
December 31, 2018
  
   
Unpaid Principal Balance
    
Recorded Investment with No Allowance
    
Recorded Investment with Allowance
    
Total Recorded Investment
    
Related Allowance
    
Average Recorded Investment
    
Interest Income Recognized
  
Real estate loans:
                                                        
Construction and land development
   $
336
     $
—
     $
327
     $
327
     $
71
     $
758
     $
12
  
Secured by 1-4 family
    
720
      
356
      
307
      
663
      
172
      
966
      
22
  
Other real estate loans
    
2,290
      
2,249
      
—
      
2,249
      
—
      
1,585
      
51
  
Commercial and industrial
    
200
      
197
      
—
      
197
      
—
      
146
      
—
  
Total
   $
3,546
     $
2,802
     $
634
     $
3,436
     $
243
     $
3,455
     $
85
  
   
September 30, 2018
  
   
Unpaid Principal Balance
    
Recorded Investment with No Allowance
    
Recorded Investment with Allowance
    
Total Recorded Investment
    
Related Allowance
    
Average Recorded Investment
    
Interest Income Recognized
  
Real estate loans:
                                                        
Construction and land development
   $
343
     $
—
     $
343
     $
343
     $
87
     $
900
     $
12
  
Secured by 1-4 family
    
511
      
287
      
151
      
438
      
20
      
1,172
      
5
  
Other real estate loans
    
2,069
      
2,029
      
—
      
2,029
      
—
      
1,433
      
37
  
Commercial and industrial
    
200
      
197
      
—
      
197
      
—
      
129
      
—
  
Total
   $
3,123
     $
2,513
     $
494
     $
3,007
     $
107
     $
3,634
     $
54