Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Cash flows from operating activities:
Net earnings	$ 10,785	$ 4,343
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	4,305	5,045
Stock-based compensation expense	1,108	1,111
Net gain on investments	(1,378)	(170)
Deferred income taxes	208	(281)
Changes in operating assets and liabilities, net of effects of acquisition:
Purchases of trading securities	(20,010)	(7,150)
Proceeds from maturities and sales of trading securities	11,656	12,683
Accounts receivable, net	(2,926)	3,661
Prepaid expenses and other assets	(1,494)	(5)
Accounts payable and other liabilities	(999)	(53)
Deferred revenue	4,096	78
Net cash provided by operating activities	5,351	19,262
Cash flows from investing activities:
Capitalized computer software development costs	(3,652)	(2,471)
Purchases of property and equipment, net of disposals	(413)	(500)
Purchase of business, net of cash acquired	(9,253)	(4,441)
Net cash used in investing activities	(13,318)	(7,412)
Cash flows from financing activities:
Proceeds from exercise of stock options	6,719	4,397
Payment for accrued acquisition consideration		(200)
Dividends paid	(9,841)	(9,299)
Net cash used in financing activities	(3,122)	(5,102)
Net change in cash and cash equivalents	(11,089)	6,748
Cash and cash equivalents at beginning of period	66,001	49,004
Cash and cash equivalents at end of period	$ 54,912	$ 55,752