Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Cash flows from operating activities:
Net earnings	$ 1,593	$ 2,422
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	1,029	1,043
Stock-based compensation expense	338	391
Bond amortization	2	7
Tax benefit of stock options exercised	10	57
Excess tax benefits from stock-based compensation	(27)	(44)
Net loss on investments	361	90
Retirement of property and equipment		15
Deferred income taxes	(194)	(128)
Changes in operating assets and liabilities:
Purchases of trading securities	(3,640)	(4,233)
Proceeds from maturities and sales of trading securities	8,157	5,547
Accounts receivable, net	3,683	884
Prepaid expenses and other assets	316	399
Accounts payable and other liabilities	(692)	(1,948)
Deferred revenue	(1,685)	(580)
Net cash provided by operating activities	9,251	3,922
Cash flows from investing activities:
Capitalized computer software development costs	(717)	(863)
Purchases of property and equipment, net of disposals	(34)	(340)
Proceeds from maturities of investments	200	266
Net cash used in investing activities	(551)	(937)
Cash flows from financing activities:
Repurchase of common stock		(16)
Excess tax benefits from stock based compensation	27	44
Proceeds from exercise of stock options	487	505
Dividends paid		(2,442)
Net cash provided by (used in) financing activities	514	(1,909)
Net change in cash and cash equivalents	9,214	1,076
Cash and cash equivalents at beginning of period	41,164	39,111
Cash and cash equivalents at end of period	$ 50,378	$ 40,187