Provision for Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate	21.00%	21.00%
US vs. foreign tax rate difference	1.30%	0.50%
State income tax, net of federal benefit	3.30%	80.80%
Permanent differences	(47.30%)	(61.50%)
Increase in uncertain tax position	0.00%	0.70%
Change in valuation allowance	27.70%	(24.30%)
Income tax expense	6.00%	17.20%