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Note 8 - Regulatory Matters (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
(Dollar amounts in thousands)
  
March 31, 2020
  
December 31, 2019
   
Amount
  
Ratio
  
Amount
  
Ratio
Total capital to risk-weighted assets:
      
 
      
 
      
 
      
 
Actual
   $
81,321
 
    
12.99
%
   $
80,418
 
    
13.74
%
For capital adequacy purposes
    
50,073
 
    
8.00
%
    
46,836
 
    
8.00
%
To be well capitalized
    
62,592
 
    
10.00
%
    
58,544
 
    
10.00
%
Tier 1 capital to risk-weighted assets:
      
 
      
 
      
 
      
 
Actual
   $
74,101
 
    
11.84
%
   $
73,862
 
    
12.62
%
For capital adequacy purposes
    
37,555
 
    
6.00
%
    
35,127
 
    
6.00
%
To be well capitalized
    
50,073
 
    
8.00
%
    
46,836
 
    
8.00
%
Common Equity Tier 1 capital to risk-weighted assets:
      
 
      
 
      
 
      
 
Actual
   $
74,101
 
    
11.84
%
   $
73,862
 
    
12.62
%
For capital adequacy purposes
    
28,166
 
    
4.50
%
    
26,345
 
    
4.50
%
To be well capitalized
    
40,685
 
    
6.50
%
    
38,054
 
    
6.50
%
Tier 1 capital to average assets:
      
 
      
 
      
 
      
 
Actual
   $
74,101
 
    
8.10
%
   $
73,862
 
    
8.17
%
For capital adequacy purposes
    
36,608
 
    
4.00
%
    
36,146
 
    
4.00
%
To be well capitalized
    
45,761
 
    
5.00
%
    
45,182
 
    
5.00
%