Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Cash flows from operating activities:
Net earnings	$ 5,550	$ 7,763
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	4,311	1,897
Stock-based compensation expense	1,179	1,081
Bond amortization		1
Accretion of liability from purchase of business	9
Tax benefit of stock options exercised	102	409
Excess tax benefits from stock-based compensation	(87)	(349)
Net loss on investments	381	485
Deferred income taxes	(578)	101
Changes in operating assets and liabilities, net of effects of acquisition:
Purchases of trading securities	(14,899)	(10,291)
Proceeds from maturities and sales of trading securities	8,316	13,301
Accounts receivable, net	1,738	(1,062)
Prepaid expenses and other assets	160	(387)
Accounts payable and other liabilities	(2,929)	69
Deferred revenue	1,461	1,413
Net cash provided by operating activities	4,714	14,431
Cash flows from investing activities:
Capitalized computer software development costs	(1,725)	(2,402)
Purchases of property and equipment, net of disposals	(972)	(205)
Proceeds from maturities of investments		225
Purchase of business, net of cash acquired	(7,909)	(1,241)
Net cash used in investing activities	(10,606)	(3,623)
Cash flows from financing activities:
Repurchase of common stock	(1,100)
Excess tax benefits from stock based compensation	87	349
Proceeds from exercise of stock options	797	3,352
Payment for accrued acquisition consideration	(200)
Dividends paid	(8,472)	(2,751)
Net cash (used in) provided by financing activities	(8,888)	950
Net change in cash and cash equivalents	(14,780)	11,758
Cash and cash equivalents at beginning of period	55,803	41,164
Cash and cash equivalents at end of period	$ 41,023	$ 52,922