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Note 8 - Regulatory Matters (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
(Dollar amounts in thousands)
  
September 30, 2019
  
December 31, 2018
   
Amount
  
Ratio
  
Amount
  
Ratio
Total capital to risk-weighted assets:
      
 
      
 
      
 
      
 
Actual
   $
79,681
 
    
13.78
%
   $
76,344
 
    
12.93
%
For capital adequacy purposes
    
46,243
 
    
8.00
%
    
47,252
 
    
8.00
%
To be well capitalized
    
57,804
 
    
10.00
%
    
59,065
 
    
10.00
%
Tier 1 capital to risk-weighted assets:
      
 
      
 
      
 
      
 
Actual
   $
73,172
 
    
12.66
%
   $
69,836
 
    
11.82
%
For capital adequacy purposes
    
34,682
 
    
6.00
%
    
35,439
 
    
6.00
%
To be well capitalized
    
46,243
 
    
8.00
%
    
47,252
 
    
8.00
%
Common Equity Tier 1 capital to risk-weighted assets:
      
 
      
 
      
 
      
 
Actual
   $
73,172
 
    
12.66
%
   $
69,836
 
    
11.82
%
For capital adequacy purposes
    
26,012
 
    
4.50
%
    
26,579
 
    
4.50
%
To be well capitalized
    
37,573
 
    
6.50
%
    
38,393
 
    
6.50
%
Tier 1 capital to average assets:
      
 
      
 
      
 
      
 
Actual
   $
73,172
 
    
8.13
%
   $
69,836
 
    
7.95
%
For capital adequacy purposes
    
35,990
 
    
4.00
%
    
35,126
 
    
4.00
%
To be well capitalized
    
44,987
 
    
5.00
%
    
43,908
 
    
5.00
%