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Note 3 - Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Debt Securities, Available-for-sale [Table Text Block]
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of March 31, 2018
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
Municipals
   $
33,772,192
     $
52,108
     $
(858,930
 )   $
32,965,370
  
Corporates
    
3,000,000
      
60,791
      
-
      
3,060,791
  
Government sponsored mortgage-backed securities and SBA loan pools
    
47,274,879
      
12,439
      
(1,370,055
 )    
45,917,263
  
    $
84,047,071
     $
125,338
     $
(2,228,985
 )   $
81,943,424
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of December 31, 2017
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
Municipals
   $
33,908,207
     $
253,872
     $
(263,621
 )   $
33,898,458
  
Corporates
    
3,000,000
      
65,000
      
-
      
3,065,000
  
Government sponsored mortgage-backed securities and SBA loan pools
    
45,414,845
      
9,283
      
(908,913
 )    
44,515,215
  
    $
82,323,052
     $
328,155
     $
(1,172,534
 )   $
81,478,673
  
Available-for-sale Securities [Table Text Block]
   
Amortized
Cost
    
Approximate
Fair Value
  
1-5 years
   $
434,711
     $
434,909
  
6-10 years
    
10,751,633
      
10,600,771
  
After 10 years
    
25,585,848
      
24,990,481
  
Government sponsored mortgage-backed securities and SBA loan pools not due on a single maturity date
    
47,274,879
      
45,917,263
  
    $
84,047,071
     $
81,943,424
  
Debt Securities, Held-to-maturity [Table Text Block]
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of March 31, 2018
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
Government sponsored mortgage-backed securities
   $
15,097
     $
253
     $
(82
 )   $
15,268
  
   
Amortized
Cost
    
Gross
Unrealized
Gains
    
Gross
Unrealized
(Losses)
    
Approximate
Fair Value
  
As of December 31, 2017
 
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Debt Securities:
                                
Government sponsored mortgage-backed securities
   $
16,457
     $
327
     $
(55
 )   $
16,729
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
March 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
   $
19,061,837
     $
(483,654
 )   $
8,559,989
     $
(375,277
 )   $
27,621,826
     $
(858,931
 )
Government sponsored mortgage-backed securities and SBA loan pools
    
19,768,125
      
(497,936
 )    
21,092,337
      
(872,118
 )    
40,860,462
      
(1,370,054
 )
    $
38,829,962
     $
(981,590
 )   $
29,652,326
     $
(1,247,395
 )   $
68,482,288
     $
(2,228,985
 )
   
December 31, 2017
  
   
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
   $
11,024,593
     $
(103,747
 )   $
8,802,796
     $
(159,874
 )   $
19,827,389
     $
(263,621
 )
Government sponsored mortgage-backed securities and SBA loan pools
    
20,088,694
      
(253,907
 )    
22,191,577
      
(655,006
 )    
42,280,271
      
(908,913
 )
    $
31,113,287
     $
(357,654
 )   $
30,994,373
     $
(814,880
 )   $
62,107,660
     $
(1,172,534
 )
Held-to-maturity Securities [Member]  
Notes Tables  
Debt Securities, Held-to-maturity [Table Text Block]
   
Amortized
Cost
    
Approximate
Fair Value
  
Government sponsored mortgage-backed securities not due on a single maturity date
   $
15,097
     $
15,268