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Note 6 - (Loss) Income Per Common and Common Stock Equivalent Share (Tables)
 3 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended September 30,
  
   
2019
    
2018*
  
Numerator
      
 
      
 
Net (loss) income
   $
(310,749
 )   $
41,570
  
                 
Denominator
      
 
      
 
Weighted average shares, basic
    
7,404,831
      
7,389,751
  
Dilutive effect of stock compensation awards
    
-
      
94,115
  
Diluted shares
    
7,404,831
      
7,483,866
  
                 
Net (loss) income attributable to common shareholders per share:
                
Basic
   $
(0.04
 )   $
0.01
  
Diluted
   $
(0.04
 )   $
0.01