Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)
Cash flows from operating activities:
Net earnings	$ 12,053	$ 14,621	$ 10,242
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	6,030	6,640	5,618
Stock-based compensation expense	1,467	1,428	1,593
Accretion of liability from purchase of business			11
Net (gain)/loss on investments	(254)	(146)	994
Net (gain) on sale of fixed assets		(11,776)
Deferred income tax expense/(benefit)	621	675	(312)
Changes in operating assets and liabilities, net of effects of acquisition:
Purchases of trading securities	(24,541)	(10,267)	(13,206)
Proceeds from sales and maturities of trading securities	13,568	15,507	14,071
Accounts receivable, net	(1,774)	1,187	(945)
Prepaid expenses and other assets	(1,983)	(284)	(740)
Accounts payable and other liabilities	(1,807)	1,185	1,155
Deferred revenue	3,374	1,010	(190)
Net cash provided by operating activities	6,754	19,780	18,291
Cash flows from investing activities:
Capitalized computer software development costs	(4,804)	(3,724)	(3,246)
Purchases of property and equipment, net of disposals	(1,428)	(731)	(655)
Proceeds from sale of building		13,134
Purchase of business, net of cash acquired	(9,150)	(4,441)
Net cash (used in) provided by investing activities	(15,382)	4,238	(3,901)
Cash flows from financing activities:
Repurchase of common stock			(181)
Proceeds from exercise of stock options	8,609	5,717	1,818
Payment for accrued acquisition consideration		(200)	(200)
Dividends paid	(13,188)	(12,538)	(11,478)
Net cash used in financing activities	(4,579)	(7,021)	(10,041)
Net change in cash and cash equivalents	(13,207)	16,997	4,349
Cash and cash equivalents at beginning of year	66,001	49,004	44,655
Cash and cash equivalents at end of year	52,794	66,001	49,004
Supplemental disclosures of cash paid during the year for:
Income taxes	7,892	2,924	4,800
Supplemental disclosures of noncash operating, investing and financing activities:
Accrual of dividends payable	$ 3,367	$ 3,259	$ 2,887