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Note 9 - Time Deposits (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Time Deposit Maturities [Table Text Block]
   
At December 31, 2019
    
At December 31, 2018
  
                                 
   
Weighted-
      
 
    
Weighted-
      
 
  
   
Average
      
 
    
Average
      
 
  
Maturity
  
Rate
    
Amount
    
Rate
    
Amount
  
                                 
One year or less
  
 
2.09
%
  
$
55,567,378
     
1.51
 %   $
30,457,540
  
Over one through three years
  
 
2.08
%
  
 
22,461,008
     
2.20
 %    
43,552,518
  
Over three through five years
  
 
1.85
%
  
 
3,359,475
     
1.58
 %    
3,528,518
  
                                 
   
 
2.08
%
  
$
81,387,861
     
1.90
 %   $
77,538,576