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Note 7 - Capital Requirements (Tables)
 9 Months Ended
Sep. 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
  
September 30, 2019
      
 
      
 
      
 
      
 
      
 
      
 
Total Capital (to Risk-Weighted Assets)   $
83,591
      
14.57
 %   $
45,903
      
8.00
 %   $
57,379
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)   $
78,679
      
13.71
 %   $
34,428
      
6.00
 %   $
45,903
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)   $
78,679
      
13.71
 %   $
25,821
      
4.50
 %   $
37,296
      
6.50
 %
Tier 1 Capital (to Average Assets)   $
78,679
      
10.09
 %   $
31,205
      
4.00
 %   $
39,006
      
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
 %