Provision for Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Federal
Current		$ 0
Total		0
State
Current	$ 3,000	2,000
Total	3,000	2,000
Foreign
Current	127,000	101,000
Total	127,000	101,000
Current, total	130,000	103,000
Provision for income tax	$ 130,000	$ 103,000