Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Cash flows from operating activities:
Net earnings	$ 10,331	$ 10,411	$ 11,343
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	2,605	4,153	4,302
Stock-based compensation expense	1,509	1,476	1,287
Bond amortization	1	15	112
Accretion of liability from purchase of business	8
Tax benefit of options exercised	615	133	881
Excess tax benefits from stock-based compensation	(611)	(131)	(616)
Net loss (gain) on investments	304	(328)	367
Retirement of property and equipment		90
Deferred income taxes	956	192	(92)
Changes in operating assets and liabilities, net of effects of acquisition:
Purchases of trading securities	(14,751)	(14,710)	(18,196)
Proceeds from sales and maturities of trading securities	15,702	16,334	15,606
Accounts receivable, net	(1,609)	2,892	(1,252)
Prepaid expenses and other assets	(1,218)	22	(254)
Accounts payable and other liabilities	1,465	(3,271)	659
Deferred revenue	3,004	1,850	2,134
Net cash provided by operating activities	18,311	19,128	16,281
Cash flows from investing activities:
Capitalized computer software development costs	(2,949)	(3,418)	(2,731)
Purchases of property and equipment, net of disposals	(255)	(736)	(372)
Proceeds from maturities of investments	225	1,188	5,837
Purchase of business, net of cash acquired	(1,241)
Net cash (used in) provided by investing activities	(4,220)	(2,966)	2,734
Cash flows from financing activities:
Repurchase of common stock		(759)
Excess tax benefits from stock-based compensation	611	131	616
Proceeds from exercise of stock options	5,476	1,990	5,039
Dividends paid	(5,539)	(15,471)	(9,487)
Net cash provided by (used in) financing activities	548	(14,109)	(3,832)
Net change in cash and cash equivalents	14,639	2,053	15,183
Cash and cash equivalents at beginning of year	41,164	39,111	23,928
Cash and cash equivalents at end of year	55,803	41,164	39,111
Supplemental disclosures of cash paid during the year for:
Income taxes	4,565	5,206	6,057
Supplemental disclosures of noncash operating, investing and financing activities:
Accrual of dividends payable	$ 2,822		$ 2,433