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Note 4 - Allowance for Loan Losses (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Financing Receivable, Allowance for Credit Loss [Table Text Block]
   
December 31, 2019
  
   
Construction and Land Development
    
Secure 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
    
(2
 )    
(58
 )    
(27
 )    
(2
 )    
(795
 )    
(884
 )
Recoveries
    
50
      
9
      
1
      
8
      
291
      
359
  
Provision for (recovery of) loan losses
    
(145
 )    
(70
 )    
162
      
92
      
411
      
450
  
Ending Balance, December 31, 2019
   $
464
     $
776
     $
2,296
     $
562
     $
836
     $
4,934
  
Ending Balance:
                                                
Individually evaluated for impairment
    
22
      
11
      
—
      
—
      
—
      
33
  
Collectively evaluated for impairment
    
442
      
765
      
2,296
      
562
      
836
      
4,901
  
Loans:
      
 
      
 
      
 
      
 
      
 
      
 
Ending Balance
    
43,164
      
229,438
      
236,555
      
50,153
      
15,036
      
574,346
  
Individually evaluated for impairment
    
367
      
630
      
462
      
—
      
—
      
1,459
  
Collectively evaluated for impairment
    
42,797
      
228,808
      
236,093
      
50,153
      
15,036
      
572,887
  
   
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, 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
  
Impaired Financing Receivables [Table Text Block]
   
December 31, 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
   $
401
     $
70
     $
297
     $
367
     $
22
     $
369
     $
1
  
Secured by 1-4 family
    
729
      
488
      
142
      
630
      
11
      
769
      
1
  
Other real estate loans
    
509
      
462
      
—
      
462
      
—
      
766
      
3
  
Commercial and industrial
    
—
      
—
      
—
      
—
      
—
      
22
      
—
  
Total
   $
1,639
     $
1,020
     $
439
     $
1,459
     $
33
     $
1,926
     $
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