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Note 8 - Time Deposits (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Time Deposit Maturities [Table Text Block]
   
At December 31, 2017
    
At December 31, 2016
  
                                 
   
Weighted-
      
 
    
Weighted-
      
 
  
   
Average
    
 
 
 
  
Average
    
 
 
 
Maturity
  
Rate
    
Amount
    
Rate
    
Amount
  
                                 
One year or less
  
 
1.06
%
  
$
31,916,859
     
0.84
 %   $
39,693,113
  
Over one through three years
  
 
1.28
%
  
 
27,678,266
     
0.93
 %    
18,866,903
  
Over three through five years
  
 
1.26
%
  
 
3,454,209
     
1.17
 %    
5,000,566
  
Over five years
  
 
 -
 %
  
 
-
     
-
 %    
-
  
                                 
   
 
1.17
%
  
$
63,049,334
     
0.90
 %   $
63,560,582