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Note 4 - Financial Instruments With Off-balance-sheet Risk (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
September 30,
    
December 31,
  
   
2017
    
2016
  
                 
Commitments to originate and sell mortgage loans
  
$
27,343,176
     $
27,206,868
  
Commitments to extend credit
  
 
34,312,331
      
27,430,757
  
Unused lines of credit
  
 
11,596,085
      
8,662,628
  
Standby letters of credit
  
 
125,000
      
-
  
Totals
                
   
$
73,376,592
     $
63,300,253