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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
September 30,
 
   
201
7
    
201
6
  
Numerator
  
 
 
 
  
 
 
 
Net income
   $
1,434
     $
2,490
  
Denominator
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,607
      
6,558
  
Dilutive effect of stock options
    
224
      
89
  
Diluted weighted average common shares outstanding
    
6,831
      
6,647
  
Basic net income per common share
   $
0.22
     $
0.38
  
Diluted net income per common share
   $
0.21
     $
0.37