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Note 14 - Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]
                           
Range of rates
  
   
Variable rate
    
Fixed rate
    
Total
    
on fixed rate commitments
  
As of December 31, 2019:
                                  
Commitments to originate loans
   $
6,186,780
     $
753,600
     $
6,940,380
    
 3.75%
-
6.375%
  
Unfunded commitments on construction loans
    
656,247
      
4,304,146
      
4,960,393
    
 3.50%
-
5.00%
  
Unfunded commitments under lines of credit
    
14,126,052
      
-
      
14,126,052
    
 
-
 
  
     
20,969,079
      
5,057,746
      
26,026,825
    
 
 
 
  
Standby letters of credit
    
-
      
10,000
      
10,000
    
 
 
 
  
    $
20,969,079
     $
5,067,746
     $
26,036,825
    
 
 
 
  
As of December 31, 2018:
                                  
Commitments to originate loans
   $
615,000
     $
5,142,737
     $
5,757,737
    
 3.65%
-
8.25%
  
Unfunded commitments on construction loans
    
5,618,741
      
1,614,824
      
7,233,565
    
 2.75%
-
5.13%
  
Unfunded commitments under lines of credit
    
15,501,253
      
-
      
15,501,253
    
 
-
 
  
     
21,734,994
      
6,757,561
      
28,492,555
    
 
 
 
  
Standby letters of credit
    
-
      
-
      
-
    
 
 
 
  
    $
21,734,994
     $
6,757,561
     $
28,492,555