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Note A - Organization and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
For the Years Ended June 30,
  
   
2020
    
2019
  
Numerator
  
 
 
 
  
 
 
 
Net (loss) income
   $
(1,645
)
   $
6,541
  
Denominator
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,695
      
6,809
  
Dilutive effect of stock options and restricted stock shares
    
—
      
289
  
Diluted weighted average common shares outstanding
    
6,695
      
7,098
  
Basic net (loss) income per common share
   $
(0.25
 )   $
0.96
  
Diluted net (loss) income per common share
   $
(0.25
 )   $
0.92