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Inventories (Tables)
 3 Months Ended
Jul. 31, 2019
Inventories [Abstract]  
Inventories Inventories, net were as follows:


 
July 31, 2019
    
April 30, 2019
  
Finished Goods
  
$
36,050
    
$
33,736
  
Work-in-Process
    
3,843
      
2,094
  
Paper and Other Materials
    
354
      
373
  
   
$
40,247
    
$
36,203
  
Inventory Value of Estimated Sales Returns
    
8,585
      
3,739
  
LIFO Reserve
    
(4,021
)
    
(4,360
)
Total Inventories
  
$
44,811
    
$
35,582