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Note 16 - Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
      Actual      
For Capital
Adequacy Puroses
    
To be Well
Capitalized Under
Prompt Corrective
Action Provisions
      Amount       Ratio       Amount   Ratio     Amount   Ration
      (Dollars in thousands)
As of December 31, 2018:
  
 
 
 
  
 
 
 
  
 
 
 
    
 
 
 
  
                                     
Total Capital (to Risk-Weighted Assets)
  
$
41,685
    
 
14.50
%
  
$
22,999
  
>
8.00%
  
$
28,748
  
>
10.00%
                                     
Tier I Capital (to Risk-Weighted Assets)
  
$
38,703
    
 
13.46
%
  
$
17,252
  
>
6.00%
  
$
23,003
  
>
8.00%
                                     
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
  
$
38,703
    
 
13.46
%
  
$
12,939
  
>
4.50%
  
$
18,690
  
>
6.50%
                                     
Tier I Capital (to Average Assets)
  
$
38,703
    
 
10.29
%
  
$
15,045
  
>
4.00%
  
$
18,806
  
>
5.00%
                                     
As of December 31, 2017:
                                    
Total Capital (to Risk-Weighted Assets)
   $
45,076
      
17.21
 %   $
20,950
  
>
8.00%
   $
26,187
  
>
10.00%
                                     
Tier I Capital (to Risk-Weighted Assets)
   $
41,800
      
15.96
 %   $
15,712
  
>
6.00%
   $
20,950
  
>
8.00%
                                     
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
   $
41,800
      
15.96
 %   $
11,784
  
>
4.50%
   $
17,022
  
>
6.50%
                                     
Tier I Capital (to Average Assets)
   $
41,800
      
11.96
 %   $
14,011
  
>
4.00%
   $
17,514
  
>
5.00%