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Note 21 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Years Ended December 31,
  
   
2017
    
2016
  
                 
Basic:
                
Net income available to common shareholders
  
$
360,591
    $
5,295,127
  
Less: Earnings allocated to participating securities
  
 
(543
)
    
-
  
                 
Net income allocated to common shareholders
  
$
360,048
     $
5,295,127
  
                 
Weighted-average common shares outstanding including participating securities
  
 
3,443,695
      
3,438,385
  
Less: Participating securities
  
 
(4,915
)
    
-
  
Less: Average unallocated ESOP Shares
  
 
(181,887
)
    
(68,889
 )
                 
Average shares
  
 
3,256,893
      
3,369,496
  
                 
Basic earnings per common share
  
$
0.11
    $
1.57
  
                 
Diluted:
                
Net income allocated to common shareholders
  
$
360,048
     $
5,295,127
  
                 
Weighted-average common shares outstanding for basic earnings per common share
  
 
3,256,893
      
3,369,496
  
Add: Dilutive effects of assumed exercises of stock options
  
 
8,269
     
3,996
  
                 
Average shares and dilutive potential common shares
  
 
3,265,162
      
3,373,492
  
                 
Diluted earnings per common share
  
$
0.11
    $
1.57