Income Taxes - Tax Effects of Temporary Differences That Give Rise to Significant Portions of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Apr. 30, 2023
Deferred tax assets:
Accruals and expenses not deducted for tax purposes	$ 185	$ 221
IRS Section 174 costs	6,341	3,651
State net operating loss carryforwards	1	13
Fixed asset basis differences	0	516
Nonqualified stock options	4,121	2,664
Foreign net operating loss carryforwards	4,886	2,860
Right of use liability	12	117
Tax credit carryforwards	83	83
Total gross deferred tax assets	15,629	10,125
Less valuation allowance	(3,914)	(2,861)
Net deferred tax	11,715	7,264
Deferred tax liabilities:
Capitalized computer software development costs	(3)	(96)
Net gains/losses on trading securities	(40)	(2,160)
Goodwill and intangible assets basis differences	(4,363)	(1,705)
Right of use asset	(11)	(108)
Fixed asset basis differences	(170)	0
Deferred agent commissions	(918)	(900)
Total gross deferred tax liabilities	(5,505)	(4,969)
Net deferred tax assets	$ 6,210	$ 2,295