Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	3 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Cash flows from operating activities:
Net earnings	$ 2,288	$ 1,373
Adjustments to reconcile net earnings to net cash used in operating activities:
Depreciation and amortization	1,094	559
Stock-based compensation expense	284	230
Bond amortization	49	83
Tax benefit of stock options exercised	57	77
Excess tax benefits from stock-based compensation	78
Net loss on investments	411	163
Deferred income taxes	(310)	(407)
Changes in operating assets and liabilities:
Purchases of trading securities	(5,929)	(4,771)
Proceeds from maturities and sales of trading securities	3,699	1,261
Accounts receivable, net	(1,436)	(643)
Prepaid expenses and other assets	468	1,008
Accounts payable and other liabilities	(1,572)	220
Deferred revenue	(1,202)	(735)
Net cash used in operating activities	(2,021)	(1,582)
Cash flows from investing activities:
Capitalized computer software development costs	(604)	(631)
Purchases of property and equipment, net of disposals	(129)	(262)
Proceeds from maturities of investments	963	4,333
Net cash provided by investing activities	230	3,440
Cash flows from financing activities:
Repurchase of common stock		(369)
Excess tax benefits from stock based compensation	(78)
Proceeds from exercise of stock options	788	852
Dividends paid	(2,347)	(2,303)
Net cash used in financing activities	(1,637)	(1,820)
Net change in cash and cash equivalents	(3,428)	38
Cash and cash equivalents at beginning of period	23,928	21,730
Cash and cash equivalents at end of period	$ 20,500	$ 21,768