Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities:
Net earnings	$ 12,782	$ 8,089	$ 6,742
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	4,138	5,610	8,103
Stock-based compensation expense	3,956	2,546	2,027
Net (gain) loss on investments	(394)	(3,569)	563
Net gain on sale of fixed assets	(36)	0	0
Deferred income tax benefit	(854)	(270)	(609)
Changes in operating assets and liabilities, net of effects of acquisition:
Purchases of trading securities	(1,713)	(1,294)	(22,433)
Proceeds from sales and maturities of trading securities	1,287	3,718	34,202
Accounts receivable, net	3,031	(1,632)	(4,712)
Prepaid expenses and other assets	450	845	(1,537)
Accounts payable and other liabilities	1,562	799	2,692
Deferred revenue	4,811	2,914	944
Net cash provided by operating activities	29,020	17,756	25,982
Cash flows from investing activities:
Capitalized computer software development costs	0	(620)	(3,170)
Purchases of property and equipment, net of disposals	(934)	(678)	(420)
Net cash used in investing activities	(934)	(1,298)	(3,590)
Cash flows from financing activities:
Proceeds from exercise of stock options	8,578	6,697	10,072
Dividends paid	(14,632)	(14,311)	(13,938)
Net cash used in financing activities	(6,054)	(7,614)	(3,866)
Net change in cash and cash equivalents	22,032	8,844	18,526
Cash and cash equivalents at beginning of year	88,658	79,814	61,288
Cash and cash equivalents at end of year	110,690	88,658	79,814
Supplemental disclosures of cash paid during the year for:
Income taxes	300	518	544
Supplemental disclosures of noncash operating, investing and financing activities:
Accrual of dividends payable	$ 3,700	$ 3,615	$ 3,547