Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Oct. 31, 2013		Oct. 31, 2012		Oct. 31, 2013		Oct. 31, 2012
Revenues:
License	$ 6,192		$ 5,504		$ 9,410		$ 10,586
Services and other	11,662		12,312		22,890		24,807
Maintenance	9,077		8,447		17,949		16,784
Total revenues	26,931		26,263		50,249		52,177
Cost of revenues:
License	1,234		1,443		2,395		2,812
Services and other	8,181		8,142		16,221		16,765
Maintenance	1,990		1,998		3,952		3,910
Total cost of revenues	11,405		11,583		22,568		23,487
Gross margin	15,526		14,680		27,681		28,690
Research and development	2,004		2,303		4,104		4,409
Sales and marketing	5,018		4,937		9,412		9,758
General and administrative	3,071		2,939		6,224		6,049
Amortization of acquisition-related intangibles	125		125		250		250
(Recovery of) provision for doubtful accounts	(84)		140		(84)		267
Total operating expenses	10,134		10,444		19,906		20,733
Operating income	5,392		4,236		7,775		7,957
Other income (expense):
Interest income	215		278		466		584
Other, net	202		31		(5)		(2)
Earnings before income taxes	5,809		4,545		8,236		8,539
Income tax expense	2,116		1,774		2,950		3,346
Net earnings	$ 3,693		$ 2,771		$ 5,286		$ 5,193
Earnings per common share:
Basic	$ 0.13	[1]	$ 0.10	[1]	$ 0.19	[1]	$ 0.19	[1]
Diluted	$ 0.13	[1]	$ 0.10	[1]	$ 0.19	[1]	$ 0.19	[1]
Cash dividends declared per common share	$ 0.10		$ 0.09		$ 0.10		$ 0.18
Shares used in the calculation of earnings per common share:
Basic	27,448		27,151		27,406		27,112
Diluted	27,874		27,627		27,841		27,596

[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Class A shares are shown above. Diluted earnings per share for Class B shares under the two-class method are $0.13 and $0.10 for the three months ended October 31, 2013 and 2012 and $0.19 for the six months ended October 31, 2013 and 2012, respectively. See Note D to the Condensed Consolidated Financial Statements.