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


 
October 31, 2019
    
April 30, 2019
  
Finished Goods
  
$
36,258
    
$
33,736
  
Work-in-Process
    
2,637
      
2,094
  
Paper and Other Materials
    
344
      
373
  
   
$
39,239
    
$
36,203
  
Inventory Value of Estimated Sales Returns
    
9,889
      
3,739
  
LIFO Reserve
    
(4,096
)
    
(4,360
)
Total Inventories
  
$
45,032
    
$
35,582