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Note 8 - Earnings (Loss) Per Share (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended March 31,
  
   
2018
    
2017
  
                 
Basic:
                
Net income (loss) available to common shareholders
  
$
370,627
    $
(197,750
 )
Less: Earnings allocated to participating securities
  
 
(8,495
)
    
-
  
                 
Net income (loss) allocated to common shareholders
  
$
362,132
    $
(197,750
 )
                 
Weighted-average common shares outstanding including participating securities
  
 
3,444,390
     
3,438,190
  
Less: Average participating securities
  
 
(74,907
)
    
-
  
Less: Average unallocated ESOP Shares
  
 
(176,102
)
    
(181,887
 )
                 
Average shares
  
 
3,193,381
     
3,256,303
  
                 
Basic earnings per common share
  
$
0.11
    $
(0.06
 )
                 
Diluted:
                
Net income allocated to common shareholders
  
$
362,132
    $
(197,750
 )
                 
Weighted-average common shares outstanding for basic earnings per common share
  
 
3,193,381
     
3,256,303
  
Add: Dilutive effects of assumed exercises of stock options
  
 
13,745
     
-
  
                 
Weighted average shares and dilutive potential common shares
  
 
3,207,126
     
3,256,303
  
                 
Diluted earnings per common share
  
$
0.11
    $
(0.06
 )