Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Operating Loss Carryforwards [Line Items]
Reserve for uncertain tax positions	$ 0	$ 0
Liability for uncertain tax position	0	0
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards		700,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	$ 29,700,000	$ 27,400,000
State | Minimum
Operating Loss Carryforwards [Line Items]
Statute of limitation period	3 years
State | Maximum
Operating Loss Carryforwards [Line Items]
Statute of limitation period	4 years