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Note A - Organization and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Years Ended June 30,
  
   
2021
    
2020
  
Numerator
  
 
 
 
  
 
 
 
Net income (loss)
   $
10,768
     $
(1,645
 )
Denominator
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,291
      
6,695
  
Dilutive effect of stock options and restricted stock shares
    
88
      
—
  
Diluted weighted average common shares outstanding
    
6,379
      
6,695
  
Basic net income (loss) per common share
   $
1.71
     $
(0.25
 )
Diluted net income (loss) per common share
   $
1.69
     $
(0.25
 )