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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three
Months Ended

March
31,
    
Nine
Months Ended

March
31,
  
   
201
7
    
201
6
    
201
7
    
201
6
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income
   $
745
     $
3,023
     $
5,701
     $
6,104
  
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,582
      
6,511
      
6,569
      
6,514
  
Dilutive effect of stock options
    
32
      
52
      
79
      
115
  
Diluted weighted average common shares outstanding
    
6,614
      
6,563
      
6,648
      
6,629
  
Basic net income per common share
   $
0.11
     $
0.46
     $
0.87
     $
0.94
  
Diluted net income per common share
   $
0.11
     $
0.46
     $
0.86
     $
0.92