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Note 15 - Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
   
2017
  
   
Actual Regulatory Capital
    
 
 
 
  
 
 
 
   
Amount
    
Ratio
    
Minimum
Requirement
    
To Be Well
Capitalized
  
   
(Dollars in Thousands)
  
Common equity Tier 1 capital (to risk-weighted assets)
   $
74,383
      
18.41
%
    
5.750
%
    
6.50
%
Tier 1 capital (to risk-weighted assets)
    
74,383
      
18.41
%
    
7.250
%
    
8.00
%
Total capital (to risk-weighted assets)
    
79,157
      
19.60
%
    
9.250
%
    
10.00
%
Tier 1 leverage (to average assets)
    
74,383
      
11.89
%
    
4.00
%
    
5.00
%
   
2016
  
   
Actual Regulatory Capital
    
 
 
 
  
 
 
 
   
Amount
    
Ratio
    
Minimum
Requirement
    
To Be Well
Capitalized
  
   
(Dollars in Thousands)
  
Common equity Tier 1 capital (to risk-weighted assets)
   $
73,433
      
19.01
 %    
5.125
 %    
6.50
 %
Tier 1 capital (to risk-weighted assets)
    
73,433
      
19.01
%
    
6.625
%
    
8.00
%
Total capital (to risk-weighted assets)
    
78,279
      
20.26
%
    
8.625
%
    
10.00
%
Tier 1 leverage (to average assets)
    
73,433
      
12.27
%
    
4.00
%
    
5.00
%