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Product Development Assets (Tables)
12 Months Ended
Apr. 30, 2019
Product Development Assets [Abstract]  
Product Development Assets
Product development assets consisted of the following at April 30:

  
2019
  
2018
 
Book Composition Costs
 
$
19,197
  
$
24,887
 
Software Costs
  
38,048
   
52,078
 
Content Development Costs
  
5,225
   
1,849
 
Total
 
$
62,470
  
$
78,814