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Inventories (Tables)
 9 Months Ended
Jan. 31, 2021
Inventories [Abstract]  
Inventories
Inventories, net consisted of the following:

  
January 31, 2021
    
April 30, 2020
  
Finished Goods
  
$
29,996
    
$
36,014
  
Work-in-Process
    
1,660
      
1,398
  
Paper and Other Materials
    
269
      
331
  
Total Inventories Before Estimated Sales Returns and LIFO Reserve
  
$
31,925
    
$
37,743
  
Inventory Value of Estimated Sales Returns
    
11,800
      
8,686
  
LIFO Reserve
    
(3,040
)
    
(2,815
)
Total Inventories
  
$
40,685
    
$
43,614