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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
March 31,
    
March 31,
  
   
2021
    
2020
    
2021
    
2020
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income (loss)
   $
1,916
     $
(4,015
)
   $
7,806
     $
(3,443
)
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,201
      
6,565
      
6,296
      
6,734
  
Dilutive effect of stock options and restricted stock
    
126
      
—
      
105
      
—
  
Diluted weighted average common shares outstanding
    
6,327
      
6,565
      
6,401
      
6,734
  
                                 
Basic net income (loss) per common share
   $
0.31
     $
(0.61
)
   $
1.24
     $
(0.51
)
                                 
Diluted net income (loss) per common share
   $
0.30
     $
(0.61
)
   $
1.22
     $
(0.51
)