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Note 7 - Capital Requirements (Tables)
 3 Months Ended
Mar. 31, 2020
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
  
March 31, 2020
      
 
      
 
      
 
      
 
      
 
      
 
Total Capital (to Risk-Weighted Assets)   $
86,849
      
14.98
 %   $
46,373
      
8.00
 %   $
57,967
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)   $
81,265
      
14.02
 %   $
34,780
      
6.00
 %   $
46,373
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)   $
81,265
      
14.02
 %   $
26,085
      
4.50
 %   $
37,678
      
6.50
 %
Tier 1 Capital (to Average Assets)   $
81,265
      
10.08
 %   $
32,245
      
4.00
 %   $
40,307
      
5.00
 %
December 31, 2019
      
 
      
 
      
 
      
 
      
 
      
 
Total Capital (to Risk-Weighted Assets)
   $
85,439
      
14.84
 %   $
46,046
      
8.00
 %   $
57,557
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)
   $
80,505
      
13.99
 %   $
34,534
      
6.00
 %   $
46,046
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
80,505
      
13.99
 %   $
25,901
      
4.50
 %   $
37,412
      
6.50
 %
Tier 1 Capital (to Average Assets)
   $
80,505
      
10.13
 %   $
31,799
      
4.00
 %   $
39,749
      
5.00
 %