Note 3 - Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Marketable Securities [Table Text Block]
 
 
Amortized
Cost
 
 
Gross
Unrealized
Gains
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
Securities Available for Sale
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government Agencies
                                
Mortgage-Backed
 
$
326,694,417
 
 
$
75,743
 
 
$
(7,672,786
)
 
$
319,097,374
 
State, County and Municipal
 
 
4,572,756
 
 
 
18,350
 
 
 
(30,610
)
 
 
4,560,496
 
                                 
 
 
$
331,267,173
 
 
$
94,093
 
 
$
(7,703,396
)
 
$
323,657,870
 
 
 
Amortized
Cost
 
 
Gross
Unrealized
Gains
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
Securities Available for Sale
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government Agencies
                                
Mortgage-Backed
   $
297,778,875
     $
62,815
     $
(6,791,837
 )   $
291,049,853
  
State, County and Municipal
    
5,089,137
      
30,542
      
(20,233
 )    
5,099,446
  
                                 
    $
302,868,012
     $
93,357
     $
(6,812,070
 )   $
296,149,299
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
Securities
  
 
 
Available
for
Sale
 
 
 
Amortized
Cost
 
 
Fair
Value
 
                 
Due in One Year or Less
   $
360,471
     $
362,760
  
Due After One Year Through Five Years
    
1,618,395
      
1,610,940
  
Due After Five Years Through Ten Years
    
1,106,315
      
1,107,718
  
Due After Ten Years
    
1,487,575
      
1,479,078
  
     
4,572,756
      
4,560,496
  
                 
                 
Mortgage-Backed Securities
    
326,694,417
      
319,097,374
  
                 
    $
331,267,173
     $
323,657,870
  
Schedule of Unrealized Loss on Investments [Table Text Block]
 
 
Less
Than
12
Months
 
 
12
Months
or
Greater
 
 
Total
 
 
 
Fair
Value
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
 
Gross
Unrealized
Losses
 
 
Fair
Value
 
 
Gross
Unrealized
Losses
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government Agencies
                                                
Mortgage-Backed
 
$
174,200,881
 
 
$
(3,459,564
)
 
$
107,481,698
 
 
$
(4,213,222
)
 
$
281,682,579
 
 
$
(7,672,786
)
State, County and Municipal
 
 
3,487,647
 
 
 
(30,610
)
 
 
-
 
 
 
-
 
 
 
3,487,647
 
 
 
(30,610
)
                                                 
 
 
$
177,688,528
 
 
$
(3,490,174
)
 
$
107,481,698
 
 
$
(4,213,222
)
 
$
285,170,226
 
 
$
(7,703,396
)
                                                 
December 31, 2015
                                                
U.S. Government Agencies
                                                
Mortgage-Backed
   $
139,765,025
     $
(1,270,011
 )   $
139,720,125
     $
(5,521,826
 )   $
279,485,150
     $
(6,791,837
 )
State, County and Municipal
    
1,034,613
      
(20,233
 )    
-
      
-
     
1,034,613
      
(20,233
 )
                                                 
    $
140,799,638
     $
(1,290,244
 )   $
139,720,125
    $
(5,521,826
 )   $
280,519,763
     $
(6,812,070
 )