Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Cash flows from operating activities:
Net earnings	$ 9,201	$ 5,037
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	3,170	4,441
(Gain) on sale of fixed assets	(36)	0
Stock-based compensation expense	2,910	1,901
Net gain on investments	(1,073)	(1,945)
Deferred income taxes	(167)	(325)
Changes in operating assets and liabilities:
Purchases of trading securities	(215)	(779)
Proceeds from maturities and sales of trading securities	831	3,534
Accounts receivable, net	(780)	5,248
Prepaid expenses and other assets	(653)	922
Accounts payable and other liabilities	(91)	(1,897)
Deferred revenue	953	(2,204)
Net cash provided by operating activities	14,050	13,933
Cash flows from investing activities:
Capitalized computer software development costs	0	(604)
Purchases of property and equipment, net of disposals	(801)	(461)
Net cash used in investing activities	(801)	(1,065)
Cash flows from financing activities:
Proceeds from exercise of stock options	7,405	4,735
Dividends paid	(10,957)	(10,696)
Net cash used in financing activities	(3,552)	(5,961)
Net change in cash and cash equivalents	9,697	6,907
Cash and cash equivalents at beginning of period	88,658	79,814
Cash and cash equivalents at end of period	98,355	86,721
Supplemental disclosures of noncash operating, investing and financing activities:
Income taxes, net of refunds	180	485
Accrual of dividends payable	$ 3,689	$ 3,597