Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Cash flows from operating activities:
Net earnings	$ 1,688	$ 2,572
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	1,407	1,411
Stock-based compensation expense	388	398
Accretion of liability from purchase of business		3
Tax benefit of stock options exercised		14
Excess tax benefits from stock-based compensation		(13)
Net (gain) loss on investments	(216)	186
Deferred income taxes	8	(143)
Changes in operating assets and liabilities:
Purchases of trading securities	(1,871)	(3,210)
Proceeds from maturities and sales of trading securities	4,843	3,462
Accounts receivable, net	2,528	2,299
Prepaid expenses and other assets	282	316
Accounts payable and other liabilities	(2,329)	(289)
Deferred revenue	(1,698)	(1,741)
Net cash provided by operating activities	5,030	5,265
Cash flows from investing activities:
Capitalized computer software development costs	(636)	(817)
Purchases of property and equipment, net of disposals	(144)	(65)
Net cash used in investing activities	(780)	(882)
Cash flows from financing activities:
Excess tax benefits from stock based compensation		13
Proceeds from exercise of stock options	1,479	256
Dividends paid	(2,896)	(2,861)
Net cash used in financing activities	(1,417)	(2,592)
Net change in cash and cash equivalents	2,833	1,791
Cash and cash equivalents at beginning of period	49,004	44,655
Cash and cash equivalents at end of period	$ 51,837	$ 46,446