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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine months Ended
  
   
March 31,
    
March 31,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income
   $
1,994
     $
2,051
     $
6,734
     $
2,167
  
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,800
      
6,639
      
6,791
      
6,620
  
Dilutive effect of stock options and restricted stock
    
595
      
270
      
321
      
241
  
Diluted weighted average common shares outstanding
    
7,395
      
6,909
      
7,120
      
6,861
  
                                 
Basic net income per common share
   $
0.29
     $
0.31
     $
0.99
     $
0.33
  
                                 
Diluted net income per common share
   $
0.27
     $
0.30
     $
0.95
     $
0.32