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Note 5 - Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
  
   
March 31,
  
   
2019
    
2018
  
Net income available to common stockholders
   $
400,070
     $
479,582
  
Basic potential common shares:
                
Weighted average shares outstanding
    
3,346,185
      
3,429,002
  
Weighted average unvested MRP share
    
(3,060
 )    
-
  
Weighted average unallocated ESOP shares
    
(157,022
 )    
(175,801
 )
Basic weighted average shares outstanding
    
3,186,103
      
3,253,201
  
Dilutive potential common shares:
                
Weighted average unrecognized compensation on MRP shares
    
103
      
-
  
Weighted average RRP options outstanding
    
5,541
      
8,679
  
Dilutive weighted average shares outstanding
    
3,191,747
      
3,261,880
  
Basic earnings per share
   $
0.13
     $
0.15
  
Diluted earnings per share
   $
0.13
     $
0.15