Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Oct. 31, 2011		Oct. 31, 2010		Oct. 31, 2011		Oct. 31, 2010
Revenues:
License	$ 7,048		$ 4,266		$ 13,736		$ 7,060
Services and other	10,535		9,467		19,802		18,698
Maintenance	8,015		7,220		15,769		14,289
Total revenues	25,598		20,953		49,307		40,047
Cost of revenues:
License	1,487		1,450		3,322		2,143
Services and other	7,589		6,657		14,506		13,208
Maintenance	1,888		1,845		3,653		3,501
Total cost of revenues	10,964		9,952		21,481		18,852
Gross margin	14,634		11,001		27,826		21,195
Research and development	1,949		1,909		3,899		3,686
Sales and marketing	4,795		3,836		9,101		7,153
General and administrative	3,010		3,049		6,126		5,891
Amortization of acquisition-related intangibles	135		201		270		415
Provision for doubtful accounts	29		12		120		40
Severance expenses			219				219
Total operating expenses	9,918		9,226		19,516		17,404
Operating income	4,716		1,775		8,310		3,791
Other income (expense):
Interest income	331		358		694		724
Other, net	(228)		279		(604)		154
Earnings before income taxes	4,819		2,412		8,400		4,669
Income tax expense	1,838		938		3,131		1,822
Net earnings	$ 2,981		$ 1,474		$ 5,269		$ 2,847
Earnings per common share (a):
Basic	$ 0.11	[1]	$ 0.06	[1]	$ 0.20	[1]	$ 0.11	[1]
Diluted	$ 0.11	[1]	$ 0.06	[1]	$ 0.20	[1]	$ 0.11	[1]
Cash dividends declared per common share	$ 0.09		$ 0.09		$ 0.18		$ 0.18
Shares used in the calculation of earnings per common share:
Basic	26,263		25,706		26,197		25,624
Diluted	26,825		25,986		26,802		25,955

[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 $0.11 and $0.06 for the three months ended October 31, 2011 and 2010 and $0.20 and $0.11 for the six months ended October 31, 2011 and 2010, respectively. See Note D to the Condensed Consolidated Financial Statements.