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Note 7 - Capital Requirements (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
   
Actual
    
Minimum Capital
Requirement
    
Minimum
To Be Well
Capitalized Under
Prompt Corrective
Action Provisions
  
   
Amount
    
Ratio
    
Amount
    
Ratio
    
Amount
    
Ratio
  
June 30, 2019
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total Capital (to Risk-Weighted Assets)   $
82,078
      
14.24
 %   $
46,127
      
8.00
 %   $
57,658
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)   $
77,083
      
13.37
 %   $
34,595
      
6.00
 %   $
46,127
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)   $
77,083
      
13.37
 %   $
25,946
      
4.50
 %   $
37,478
      
6.50
 %
Tier 1 Capital (to Average Assets)   $
77,083
      
9.96
 %   $
30,970
      
4.00
 %   $
38,712
      
5.00
 %
December 31, 2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Total Capital (to Risk-Weighted Assets)
   $
74,697
      
13.62
 %   $
43,859
      
8.00
 %   $
54,824
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)
   $
69,688
      
12.71
 %   $
32,894
      
6.00
 %   $
43,859
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
69,688
      
12.71
 %   $
24,671
      
4.50
 %   $
35,635
      
6.50
 %
Tier 1 Capital (to Average Assets)
   $
69,688
      
9.26
 %   $
30,100
      
4.00
 %   $
37,625
      
5.00
 %