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Note 7 - Capital Requirements (Tables)
 3 Months Ended
Mar. 31, 2021
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, 2021
      
 
      
 
      
 
      
 
      
 
      
 
Total Capital (to Risk-Weighted Assets)   $
94,044
      
16.05
 %   $
46,883
      
8.00
 %   $
58,604
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)   $
86,717
      
14.80
 %   $
35,162
      
6.00
 %   $
46,883
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)   $
86,717
      
14.80
 %   $
26,372
      
4.50
 %   $
38,093
      
6.50
 %
Tier 1 Capital (to Average Assets)   $
86,717
      
8.78
 %   $
39,502
      
4.00
 %   $
49,377
      
5.00
 %
December 31, 2020
      
 
      
 
      
 
      
 
      
 
      
 
Total Capital (to Risk-Weighted Assets)
   $
91,243
      
15.82
 %   $
46,129
      
8.00
 %   $
57,661
      
10.00
 %
Tier 1 Capital (to Risk-Weighted Assets)
   $
84,032
      
14.57
 %   $
34,597
      
6.00
 %   $
46,129
      
8.00
 %
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
84,032
      
14.57
 %   $
25,948
      
4.50
 %   $
37,480
      
6.50
 %
Tier 1 Capital (to Average Assets)
   $
84,032
      
8.80
 %   $
38,187
      
4.00
 %   $
47,733
      
5.00
 %