Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)
Cash flows from operating activities:
Net earnings	$ 6,803	$ 12,053	$ 14,621
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	7,719	6,030	6,640
Stock-based compensation expense	1,751	1,467	1,428
Net gain on investments	(373)	(254)	(146)
Net gain on sale of fixed assets	(4)	0	(11,776)
Deferred income tax expense	320	621	675
Changes in operating assets and liabilities, net of effects of acquisition:
Purchases of trading securities	(10,254)	(24,541)	(10,267)
Proceeds from sales and maturities of trading securities	18,447	13,568	15,507
Accounts receivable, net	2,165	(1,774)	1,187
Prepaid expenses and other assets	536	(1,983)	(284)
Accounts payable and other liabilities	(3,611)	(1,807)	1,185
Deferred revenue	431	3,374	1,010
Net cash provided by operating activities	23,930	6,754	19,780
Cash flows from investing activities:
Capitalized computer software development costs	(5,961)	(4,804)	(3,724)
Purchases of property and equipment, net of disposals	(1,252)	(1,428)	(731)
Proceeds from sale of building	0	0	13,134
Purchase of business, net of cash acquired	0	(9,150)	(4,441)
Net cash (used in) provided by investing activities	(7,213)	(15,382)	4,238
Cash flows from financing activities:
Proceeds from exercise of stock options	5,367	8,609	5,717
Payment for accrued acquisition consideration	0	0	(200)
Dividends paid	(13,590)	(13,188)	(12,538)
Net cash used in financing activities	(8,223)	(4,579)	(7,021)
Net change in cash and cash equivalents	8,494	(13,207)	16,997
Cash and cash equivalents at beginning of year	52,794	66,001	49,004
Cash and cash equivalents at end of year	61,288	52,794	66,001
Supplemental disclosures of cash paid during the year for:
Income taxes	516	7,892	2,924
Supplemental disclosures of noncash operating, investing and financing activities:
Accrual of dividends payable	$ 3,434	$ 3,367	$ 3,259