Income Taxes (Details Narrative) - USD ($)	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	$ 0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	560,000	$ 127,672,000	$ 11,212,000
Valuation adjustments		$ 11,300,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry forward	442,400,000
Research and development credit carry forwards	5,800,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry forward	294,700,000
Research and development credit carry forwards	1,500,000
Other State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carry forward	$ 900,000