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Note 6 - (Loss) Income Per Common and Common Stock Equivalent Share (Tables)
 6 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended December 31,
    
Six Months Ended December 31,
  
   
2019
    
2018*
    
2019
    
2018*
  
Numerator
      
 
      
 
      
 
      
 
Net (loss) income
   $
(215,713
 )   $
103,149
     $
(526,462
 )   $
144,719
  
                                 
Denominator
      
 
      
 
      
 
      
 
Weighted average shares, basic
    
7,404,831
      
7,404,831
      
7,404,831
      
7,397,291
  
Dilutive effect of stock compensation awards
    
-
      
8,560
      
-
      
26,226
  
Diluted shares
    
7,404,831
      
7,413,391
      
7,404,831
      
7,423,517
  
                                 
Net (loss) income attributable to common shareholders per share:
                                
Basic
   $
(0.03
 )   $
0.01
     $
(0.07
 )   $
0.02
  
Diluted
   $
(0.03
 )   $
0.01
     $
(0.07
 )   $
0.02