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Note A - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
    
Six Months Ended
  
   
December 31,
    
December 31,
  
   
201
7
    
2016
    
201
7
    
2016
  
Numerator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Net (loss) i
ncome
   $
(1,318
)
   $
2,466
     $
116
     $
4,956
  
                                 
Denominator
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic weighted average common shares outstanding
    
6,615
      
6,567
      
6,611
      
6,563
  
Dilutive effect of stock options
    
—
      
116
      
226
      
102
  
Diluted weighted average common shares outstanding
    
6,615
      
6,683
      
6,837
      
6,665
  
                                 
Basic net
(loss) income per common share
   $
(0.20
)
   $
0.38
     $
0.02
     $
0.76
  
                                 
Diluted net (loss) income per common share
   $
(0.20
)
   $
0.37
     $
0.02
     $
0.74