Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net earnings	$ 2,725	$ 1,688
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	1,385	1,407
Stock-based compensation expense	316	388
Net gain on investments	(113)	(216)
Deferred income taxes	120	8
Changes in operating assets and liabilities:
Purchases of trading securities	(5,439)	(1,871)
Proceeds from maturities and sales of trading securities	5,010	4,843
Accounts receivable, net	3,504	2,528
Prepaid expenses and other assets	255	282
Accounts payable and other liabilities	(2,669)	(2,329)
Deferred revenue	(1,079)	(1,698)
Net cash provided by operating activities	4,015	5,030
Cash flows from investing activities:
Capitalized computer software development costs	(1,287)	(636)
Purchases of property and equipment, net of disposals	(133)	(144)
Net cash used in investing activities	(1,420)	(780)
Cash flows from financing activities:
Proceeds from exercise of stock options	890	1,479
Dividends paid	(3,259)	(2,896)
Net cash used in financing activities	(2,369)	(1,417)
Net change in cash and cash equivalents	226	2,833
Cash and cash equivalents at beginning of period	66,001	49,004
Cash and cash equivalents at end of period	$ 66,227	$ 51,837