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Note 4 - Financial Instruments With Off-balance-sheet Risk (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
   
March 31,
    
December 31,
  
   
2018
    
2017
  
                 
Commitments to originate and sell mortgage loans
  
$
37,833,362
    $
27,440,793
  
Commitments to extend credit
  
 
32,356,902
     
23,425,182
  
Unused lines of credit
  
 
13,819,328
     
13,576,993
  
Standby letters of credit
  
 
125,000
     
125,000
  
Totals
  
$
84,134,592
    $
64,567,968