Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
		Aug. 22, 2018	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Revenues:
Revenues			$ 28,033	$ 26,337	$ 55,432	$ 53,222
Cost of revenues:
Cost of revenues			13,366	12,331	27,013	23,992
Gross margin			14,667	14,006	28,419	29,230
Research and development			3,332	2,643	7,007	5,151
Sales and marketing			5,304	4,437	10,484	9,670
General and administrative			4,408	3,616	8,601	7,155
Amortization of acquisition-related intangibles			97	68	194	391
Total operating expenses			13,141	10,764	26,286	22,367
Operating income			1,526	3,242	2,133	6,863
Other (expense)/income:
Interest income			524	354	1,027	717
Other, net			(714)	322	(464)	558
Earnings before income taxes			1,336	3,918	2,696	8,138
Income tax expense			93	1,438	68	2,933
Net earnings			$ 1,243	$ 2,480	$ 2,628	$ 5,205
Earnings per common share:
Basic	[1]		$ 0.04	$ 0.08	$ 0.09	$ 0.17
Diluted	[1]		0.04	0.08	0.08	0.17
Cash dividends declared per common share		$ 0.11	$ 0.11	$ 0.11	$ 0.22	$ 0.22
Shares used in the calculation of earnings per common share:
Basic			30,926	29,906	30,825	29,788
Diluted			31,477	30,229	31,412	30,110
License
Revenues:
Revenues			$ 2,012	$ 2,449	$ 3,714	$ 6,464
Cost of revenues:
Cost of revenues			1,760	1,651	3,474	2,966
Subscription Fees
Revenues:
Revenues			3,341	2,041	6,509	3,660
Cost of revenues:
Cost of revenues			1,289	903	2,356	1,749
Professional Services and Other
Revenues:
Revenues			11,056	11,008	22,064	21,431
Cost of revenues:
Cost of revenues			8,103	7,488	16,771	14,761
Maintenance
Revenues:
Revenues			11,624	10,839	23,145	21,667
Cost of revenues:
Cost of revenues			$ 2,214	$ 2,288	$ 4,412	$ 4,516

[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 $0.08 for the three months ended October 31, 2018 and 2017, and $0.09 and $0.17 for the six months ended October 31, 2018 and 2017, respectively. See Note D to the Condensed Consolidated Financial Statements.