• Filing Date: 2019-07-11
  • Form Type: 10-K
  • Description: Annual report
v3.19.2
Schedules of Concentration of Risk, by Risk Factor (Details) - Trade Accounts Receivable [Member]
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Customer A [Member]    
Concentration Risk, Percentage 13.00% 2.00%
Customer B [Member]    
Concentration Risk, Percentage 7.00% 13.00%
Customer C [Member]    
Concentration Risk, Percentage 0.00% 18.00%