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Note G - Economic Dependency (Tables)
 3 Months Ended
Sep. 30, 2019
Supplier Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
September 30,
  
   
2019
    
2018
  
                 
Supplier 1
   $
(a
 )    
3,107
  
Supplier 2
    
(a
 )    
(a
 )
    $
(a
 )    
3,107
  
Customer Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
September 30,
  
   
2019
    
2018
  
                 
Customer 1
   $
14,354
     $
21,078
  
Customer 2
    
3,970
      
3,729
  
Customer 3
    
3,225
    
(a
 )
    $
21,549
     $
24,807