Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Revenues:
Revenues		$ 28,210	$ 28,033	$ 55,593	$ 55,432
Cost of revenues:
Cost of revenues		13,024	13,366	25,785	27,013
Gross margin		15,186	14,667	29,808	28,419
Research and development		4,209	3,332	7,537	7,007
Sales and marketing		5,148	5,304	10,727	10,484
General and administrative		4,908	4,408	9,729	8,601
Amortization of acquisition-related intangibles		78	97	175	194
Total operating expenses		14,343	13,141	28,168	26,286
Operating income		843	1,526	1,640	2,133
Other income:
Interest income		400	524	875	1,027
Other, net		312	(714)	362	(464)
Earnings before income taxes		1,555	1,336	2,877	2,696
Income tax (benefit)/expense		(204)	93	(34)	68
Net earnings		$ 1,759	$ 1,243	$ 2,911	$ 2,628
Earnings per common share
Basic (in usd per share)	[1]	$ 0.06	$ 0.04	$ 0.09	$ 0.09
Diluted (in usd per share)	[1]	0.05	0.04	0.09	0.08
Cash dividends declared per common share (in usd per share)		$ 0.11	$ 0.11	$ 0.22	$ 0.22
Shares used in the calculation of earnings per common share
Basic (in shares)		31,609	30,926	31,440	30,825
Diluted (in shares)		32,310	31,477	32,066	31,412
Class B Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.06	$ 0.04	$ 0.09	$ 0.09
Diluted (in usd per share)		$ 0.06	$ 0.04	$ 0.10	$ 0.09
Shares used in the calculation of earnings per common share
Basic (in shares)		1,822	1,822	1,822	1,866
Diluted (in shares)		1,822	1,822	1,822	1,866
License
Revenues:
Revenues		$ 1,046	$ 2,012	$ 2,824	$ 3,714
Cost of revenues:
Cost of revenues		1,007	1,760	2,387	3,474
Subscription Fees
Revenues:
Revenues		5,492	3,341	9,950	6,509
Cost of revenues:
Cost of revenues		2,610	1,289	4,735	2,356
Professional Services and Other
Revenues:
Revenues		10,826	11,056	20,963	22,064
Cost of revenues:
Cost of revenues		7,543	8,103	14,948	16,771
Maintenance
Revenues:
Revenues		10,846	11,624	21,856	23,145
Cost of revenues:
Cost of revenues		$ 1,864	$ 2,214	$ 3,715	$ 4,412

[1] (a)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 $0.06 and $0.04 for the three months ended October 31, 2019 and 2018, and $0.10 and $0.09 for the six months ended October 31, 2019 and 2018 respectively. See Note E to the Condensed Consolidated Financial Statements.