Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)
Cash flows from operating activities:
Net earnings	$ 6,742	$ 6,803	$ 12,053
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	8,103	7,719	6,030
Stock-based compensation expense	2,027	1,751	1,467
Net loss (gain) on investments	563	(373)	(254)
Net gain on sale of fixed assets	0	(4)	0
Deferred income tax (benefit) expense	(609)	320	621
Purchases of trading securities	(22,433)	(10,254)	(24,541)
Proceeds from sales and maturities of trading securities	34,202	18,447	13,568
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable, net	(4,712)	2,165	(1,774)
Prepaid expenses and other assets	(1,537)	536	(1,983)
Accounts payable and other liabilities	2,692	(3,611)	(1,807)
Deferred revenue	944	431	3,374
Net cash provided by operating activities	25,982	23,930	6,754
Cash flows from investing activities:
Capitalized computer software development costs	(3,170)	(5,961)	(4,804)
Purchases of property and equipment, net of disposals	(420)	(1,252)	(1,428)
Purchase of business, net of cash acquired	0	0	(9,150)
Net cash used in provided by investing activities	(3,590)	(7,213)	(15,382)
Cash flows from financing activities:
Proceeds from exercise of stock options	10,072	5,367	8,609
Dividends paid	(13,938)	(13,590)	(13,188)
Net cash used in financing activities	(3,866)	(8,223)	(4,579)
Net change in cash and cash equivalents	18,526	8,494	(13,207)
Cash and cash equivalents at beginning of year	61,288	52,794	66,001
Cash and cash equivalents at end of year	79,814	61,288	52,794
Supplemental disclosures of cash paid during the year for:
Income taxes	544	516	7,892
Supplemental disclosures of noncash operating, investing and financing activities:
Accrual of dividends payable	$ 3,547	$ 3,434	$ 3,367