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Note F - Economic Dependency (Tables)
 9 Months Ended
Mar. 31, 2017
Supplier Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended
March
31,
    
Nine
Months Ended
March
31,
  
   
201
7
    
201
6
    
201
7
    
201
6
  
   
Raw
Material
Purchases by
Supplier
    
%
of Total
Raw
Material
Purchases
    
Raw
Material
Purchases by
Supplier
    
%
of Total
Raw
Material
Purchases
    
Raw
Material
Purchases by
Supplier
    
%
of Total
Raw
Material
Purchases
    
Raw
Material
Purchases by
Supplier
    
%
of Total
Raw
Material
Purchases
  
Supplier
1
   $
1,683
      
16
 %    
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )
Supplier 2
    
1,646
      
16
      
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )
Supplier 3
    
1,317
      
13
      
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )
    $
4,646
      
45
 %    
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )    
(a
 )
Customer Concentration Risk [Member]  
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Three Months Ended March
31,
    
Nine Months Ended March
31,
  
                                 
   
2017
    
2016
    
2017
    
2016
  
   
Net
Sales by
Customer
    
Net
Sales by
Customer
    
Net
Sales by
Customer
    
Net
Sales by
Customer
  
Customer
1
   $
11,046
     $
13,023
     $
43,198
     $
31,714
  
Customer
2
    
(a
 )    
3,367
      
(a
 )    
9,705
  
Customer
3
    
(a
 )    
3,196
      
(a
 )    
(a
 )
    $
11,046
     $
19,586
     $
43,198
     $
41,419