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Note F - Economic Dependency (Tables)
 6 Months Ended
Dec. 31, 2017
Supplier Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
December 31,
    
Six Months Ended
December 31,
  
   
201
7
    
2016
    
201
7
    
2016
  
                                 
Supplier 1
  
$
(a)
    
 
(a)
     $
2,992
    
 
(a)
  
Supplier 2
    
1,684
    
 
(a)
      
2,911
    
 
(a)
  
Supplier 3
    
1,718
    
 
(a)
    
 
(a)
    
 
(a)
  
    $
3,402
      
—
     $
5,903
      
—
  
Customer Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
December 31,
    
Six Months Ended
December 31,
  
   
201
7
    
2016
    
201
7
    
2016
  
                                 
Customer 1
   $
19,134
     $
15,074
     $
32,292
     $
32,152
  
Customer 2
    
4,079
    
 
(a)
      
7,239
    
 
(a)
  
    $
23,213
     $
15,074
     $
39,531
     $
32,152