Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2014		Oct. 31, 2013
Revenues:
License	$ 3,012		$ 6,192		$ 7,380		$ 9,410
Services and other	11,794		11,662		22,786		22,890
Maintenance	9,771		9,077		19,268		17,949
Total revenues	24,577		26,931		49,434		50,249
Cost of revenues:
License	1,763		1,234		3,499		2,395
Services and other	8,543		8,181		16,338		16,221
Maintenance	2,175		1,990		4,156		3,952
Total cost of revenues	12,481		11,405		23,993		22,568
Gross margin	12,096		15,526		25,441		27,681
Research and development	2,810		2,004		6,006		4,104
Sales and marketing	4,574		5,018		9,218		9,412
General and administrative	3,161		3,071		6,376		6,224
Amortization of acquisition-related intangibles	107		125		192		250
Provision for (recovery of) doubtful accounts	65		(84)		107		(84)
Total operating expenses	10,717		10,134		21,899		19,906
Operating income	1,379		5,392		3,542		7,775
Other income (expense):
Interest income	279		215		559		466
Other, net	210		202		236		(5)
Earnings before income taxes	1,868		5,809		4,337		8,236
Income tax expense	693		2,116		1,628		2,950
Net earnings	$ 1,175		$ 3,693		$ 2,709		$ 5,286
Earnings per common share:
Basic	$ 0.04	[1]	$ 0.13	[1]	$ 0.10	[1]	$ 0.19	[1]
Diluted	$ 0.04	[1]	$ 0.13	[1]	$ 0.10	[1]	$ 0.19	[1]
Cash dividends declared per common share	$ 0.10		$ 0.10		$ 0.20		$ 0.10
Shares used in the calculation of earnings per common share:
Basic	28,270		27,448		28,252		27,406
Diluted	28,586		27,874		28,595		27,841

[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 $0.04 and $0.13 for the three months ended October 31, 2014 and 2013 and $0.10 and $0.19 for the six months ended October 31, 2014 and 2013, respectively. See Note D to the Condensed Consolidated Financial Statements.