Stock compensation expense - USD ($)	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Stock Compensation Expense
General and administrative	$ 219,601	$ 94,629
Research and development	56,480	9,945
Operations	63,261	2,487
Sales and marketing	44,744
Total	$ 384,086	$ 107,061