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Note 4 - Securities (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Debt Securities, Available-for-sale [Table Text Block]
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of September 30, 2019
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
U. S. government agencies
   $
1,499,752
     $
-
     $
(9,071
 )   $
1,490,681
  
Municipals
    
30,172,564
      
805,092
      
(22,646
 )    
30,955,010
  
Corporates
    
13,487,865
      
164,686
      
(13,115
 )    
13,639,436
  
Mortgage-backed securities - private label
    
10,963,720
      
9,367
      
(184
 )    
10,972,903
  
Government sponsored mortgage-backed securities and SBA loan pools
    
48,704,459
      
734,188
      
(142,975
 )    
49,295,672
  
    $
104,828,360
     $
1,713,333
      
(187,991
 )    
106,353,702
  
   
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
   $
386,057
     $
391,105
  
6-10 years
    
15,321,979
      
15,495,164
  
After 10 years
    
29,452,145
      
30,198,857
  
Mortgage-backed securities - private label not due on a single maturity date
    
10,963,720
      
10,972,903
  
Government sponsored mortgage-backed securities and SBA loan pools not due on a single maturity date
    
48,704,459
      
49,295,673
  
    $
104,828,360
     $
106,353,702
  
Schedule of Unrealized Loss on Investments [Table Text Block]
As of September 30, 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
   $
1,490,680
     $
(9,071
 )   $
-
     $
-
     $
1,490,680
     $
(9,071
 )
Municipals
    
1,124,104
      
(22,646
 )    
-
      
-
      
1,124,104
      
(22,646
 )
Corporates
    
2,540,521
      
(13,115
 )    
-
      
-
      
2,540,521
      
(13,115
 )
Mortgage-backed securities - private label
    
2,063,242
      
(184
 )    
-
      
-
      
2,063,242
      
(184
 )
Government sponsored mortgage-backed securities and SBA loan pools
    
8,979,065
      
(46,080
 )    
4,429,589
      
(96,895
 )    
13,408,654
      
(142,975
 )
    $
16,197,612
     $
(91,096
 )   $
4,429,589
     $
(96,895
 )   $
20,627,201
     $
(187,991
 )
As of 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
 )