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Note 8 - Time Deposits (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Time Deposit Maturities [Table Text Block]
   
At December 31, 2018
    
At December 31, 2017
  
                                 
   
Weighted-
      
 
    
Weighted-
      
 
  
   
Average
      
 
    
Average
      
 
  
Maturity
  
Rate
    
Amount
    
Rate
    
Amount
  
                                 
One year or less
  
 
1.51
%
  
$
30,457,540
      
1.06
 %   $
31,916,859
  
Over one through three years
  
 
2.20
%
  
 
43,552,518
      
1.28
 %    
27,678,266
  
Over three through five years
  
 
1.58
%
  
 
3,528,518
      
1.26
 %    
3,454,209
  
Over five years
  
 
 
 
  
 
-
      
 
      
-
  
                                 
   
 
1.90
%
  
$
77,538,576
      
1.17
 %   $
63,049,334