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Note 8 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three Months Ended March 31,
  
   
2019
    
2018
  
                 
Basic:
                
Net income
  
$
41,208
    $
370,627
  
Less: Earnings allocated to participating securities
  
 
(643
)
    
(8,495
 )
                 
Net income allocated to common shareholders
  
$
40,565
     $
362,132
  
                 
Weighted-average common shares outstanding including participating securities
  
 
3,360,612
      
3,444,390
  
Less: Average participating securities
  
 
(49,798
)
    
(74,907
 )
Less: Average unallocated ESOP Shares
  
 
(170,316
)
    
(176,102
 )
                 
Average shares
  
 
3,140,499
      
3,193,381
  
                 
Basic earnings per common share
  
$
0.01
    $
0.11
  
                 
Diluted:
                
Net income allocated to common shareholders
  
$
40,565
     $
362,132
  
                 
Weighted-average common shares outstanding for basic earnings per common share
  
 
3,140,499
      
3,193,381
  
Add: Dilutive effects of assumed exercises of stock options
  
 
4,712
     
13,745
  
                 
Weighted average shares and dilutive potential common shares
  
 
3,145,210
      
3,207,126
  
                 
Diluted earnings per common share
  
$
0.01
    $
0.11