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Inventories (Tables)
 12 Months Ended
Apr. 30, 2018
Inventories [Abstract]  
Inventories
Inventories at April 30 were as follows:
  
2018
  
2017
 
Finished Goods
 
$
36,503
  
$
38,329
 
Work-in-Process
  
2,139
   
7,078
 
Paper and Other Materials
  
550
   
650
 
   
39,192
   
46,057
 
Inventory Value of Estimated Sales Returns
  
4,626
   
4,727
 
LIFO Reserve
  
(4,329
)
  
(2,932
)
Total Inventories
 
$
39,489
  
$
47,852