Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Income Tax Contingency [Line Items]
Federal income taxes, expected statutory rate	21.00%
Effective income tax rate, provisions (benefit)	19.80%	23.50%
Accrued interest and penalties	$ 0
Gross tax-effected unrecognized tax benefits	0
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	0
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	27,100,000	$ 17,700,000
Tax credit carryforwards	$ 3,300,000	2,800,000
State tax credit carryforwards expire date	Apr. 30, 2049
Valuation allowances for net operating loss carryforward	$ 1,400,000	957,000
Valuation allowances for tax credits	$ 1,900,000	$ 2,200,000
State | Minimum
Income Tax Contingency [Line Items]
Operating loss carry forwards expiration dates	Apr. 30, 2027
State | Maximum
Income Tax Contingency [Line Items]
Operating loss carry forwards expiration dates	Apr. 30, 2040