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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
December 31,
    
December 31,
  
   
2019
    
2018
    
2019
    
2018
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net income
   $
476
     $
2,181
     $
572
     $
4,740
  
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,795
      
6,808
      
6,818
      
6,786
  
Dilutive effect of stock options and restricted stock
    
91
      
191
      
117
      
196
  
Diluted weighted average common shares outstanding
    
6,886
      
6,999
      
6,935
      
6,982
  
                                 
Basic net income per common share
   $
0.07
     $
0.32
     $
0.08
     $
0.70
  
                                 
Diluted net income per common share
   $
0.07
     $
0.31
     $
0.08
     $
0.68