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Note 3 - Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Debt Securities, Available-for-sale [Table Text Block]
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of December 31, 2019
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
U. S. government agencies
   $
2,499,755
     $
-
     $
(11,962
 )    
2,487,793
  
Municipals
    
35,625,038
      
675,382
      
(125,693
 )    
36,174,727
  
Corporates
    
15,395,190
      
154,942
      
(14,945
 )    
15,535,187
  
Mortgage-backed securities - private label
    
13,788,728
      
52,035
      
(29,392
 )    
13,811,371
  
Government sponsored mortgage-backed securities and SBA loan pools
    
49,844,049
      
585,641
      
(193,454
 )    
50,236,236
  
    $
117,152,760
     $
1,468,000
     $
(375,446
 )   $
118,245,314
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of December 31, 2018
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
Municipals
   $
34,470,648
     $
10,581
     $
(710,709
 )   $
33,770,520
  
Corporates
    
3,000,000
      
18,927
      
-
      
3,018,927
  
Government sponsored mortgage-backed securities and SBA loan pools
    
50,632,011
      
81,999
      
(1,237,260
 )    
49,476,750
  
    $
88,102,659
     $
111,507
     $
(1,947,969
 )   $
86,266,197
  
Available-for-sale Securities [Table Text Block]
   
Amortized
Cost
    
Approximate
Fair Value
  
1-5 years
   $
385,947
     $
391,254
  
5-10 years
    
18,704,471
      
18,877,281
  
After ten years
    
34,429,565
      
34,929,172
  
Mortgage-backed securities - private label not due on a single maturity date
    
13,788,728
      
13,811,371
  
Government sponsored mortgage-backed securities and SBA loan pools not due on a single maturity date
    
49,844,049
      
50,236,236
  
    $
117,152,760
     $
118,245,314
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
December 31, 2019
  
   
Less than 12 Months
    
12 Months or More
    
Total
  
Description of Securities
  
Fair Value
    
Unrealized Losses
    
Fair Value
    
Unrealized Losses
    
Fair Value
    
Unrealized Losses
  
                                                 
U.S. government agencies
   $
2,487,795
     $
(11,962
 )   $
-
     $
-
     $
2,487,795
     $
(11,962
 )
Municipals
    
7,083,208
      
(125,693
 )    
-
      
-
      
7,083,208
      
(125,693
 )
Corporates
    
2,452,005
      
(14,945
 )    
-
      
-
      
2,452,005
      
(14,945
 )
Mortgage-backed securities - private label
    
9,416,669
      
(29,392
 )    
-
      
-
      
9,416,669
      
(29,392
 )
Government sponsored mortgage-backed securities and SBA loan pools
    
18,112,148
      
(125,906
 )    
3,018,538
      
(67,548
 )    
21,130,686
      
(193,454
 )
    $
39,551,825
     $
(307,898
 )   $
3,018,538
     $
(67,548
 )   $
42,570,363
     $
(375,446
 )
   
December 31, 2018
  
   
Less than 12 Months
    
12 Months or More
    
Total
  
Description of Securities
  
Fair Value
    
Unrealized Losses
    
Fair Value
    
Unrealized Losses
    
Fair Value
    
Unrealized Losses
  
                                                 
Municipals
   $
6,324,750
     $
(67,774
 )   $
23,223,221
     $
(642,935
 )   $
29,547,971
     $
(710,709
 )
Government sponsored mortgage-backed securities and SBA loan pools
    
7,127,597
      
(112,282
 )    
33,759,028
      
(1,124,978
 )    
40,886,625
      
(1,237,260
 )
    $
13,452,347
     $
(180,056
 )   $
56,982,249
     $
(1,767,913
 )   $
70,434,596
     $
(1,947,969
 )