Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended				6 Months Ended
		Oct. 31, 2020		Oct. 31, 2019		Oct. 31, 2020	Oct. 31, 2019
Revenues:
Revenues		$ 27,881		$ 28,210		$ 55,159	$ 55,593
Cost of revenues:
Cost of revenues		13,064		13,024		26,101	25,785
Gross margin		14,817		15,186		29,058	29,808
Research and development		4,337		4,209		8,432	7,537
Sales and marketing		5,429		5,148		10,173	10,727
General and administrative		4,367		4,908		8,831	9,729
Amortization of acquisition-related intangibles		53		78		106	175
Total operating expenses		14,186		14,343		27,542	28,168
Operating income		631		843		1,516	1,640
Other income:
Interest income		97		400		223	875
Other, net		(139)		312		1,067	362
Earnings before income taxes		589		1,555		2,806	2,877
Income tax (benefit)/expense		(103)		(204)		80	(34)
Net earnings		$ 692	[1]	$ 1,759		$ 2,726	$ 2,911
Earnings per common share
Basic (in usd per share)	[2]	$ 0.02		$ 0.06		$ 0.08	$ 0.09
Diluted (in usd per share)	[2]	0.02		0.05		0.08	0.09
Cash dividends declared per common share (in usd per share)		$ 0.11	[2]	$ 0.11	[2]	$ 0.22	$ 0.22
Shares used in the calculation of earnings per common share
Basic (in shares)		32,489		31,609		32,414	31,440
Diluted (in shares)		32,896		32,310		32,919	32,066
Class B Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.02		$ 0.06		$ 0.08	$ 0.09
Diluted (in usd per share)		$ 0.02		$ 0.06		$ 0.09	$ 0.10
Shares used in the calculation of earnings per common share
Basic (in shares)		1,822		1,822		1,822	1,822
Diluted (in shares)		1,822		1,822		1,822	1,822
Subscription Fees
Revenues:
Revenues		$ 6,966		$ 5,492		$ 13,329	$ 9,950
Cost of revenues:
Cost of revenues		2,946		2,610		5,705	4,735
License
Revenues:
Revenues		450		1,046		1,237	2,824
Cost of revenues:
Cost of revenues		553		1,007		1,228	2,387
Professional Services and Other
Revenues:
Revenues		10,242		10,826		20,056	20,963
Cost of revenues:
Cost of revenues		7,624		7,543		15,454	14,948
Maintenance
Revenues:
Revenues		10,223		10,846		20,537	21,856
Cost of revenues:
Cost of revenues		$ 1,941		$ 1,864		$ 3,714	$ 3,715

[1] Amounts adjusted for rounding

[2] 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 $0.02 and $0.06 for the three months ended October 31, 2020 and 2019 and $0.09 and $0.10 for the six months ended October 31, 2020 and 2019. See Note E to the Condensed Consolidated Financial Statements.