Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Revenues:
Revenues		$ 31,211	$ 27,881	$ 60,482	$ 55,159
Cost of revenues:
Cost of revenues		12,825	13,064	25,192	26,101
Gross margin		18,386	14,817	35,290	29,058
Research and development		4,278	4,337	8,702	8,432
Sales and marketing		5,892	5,429	12,012	10,173
General and administrative		5,476	4,367	10,010	8,831
Amortization of acquisition-related intangibles		53	53	106	106
Total operating expenses		15,699	14,186	30,830	27,542
Operating income		2,687	631	4,460	1,516
Other income\(loss):
Interest income		97	97	190	223
Other, net		833	(139)	1,177	1,067
Earnings before income taxes		3,617	589	5,827	2,806
Income tax expense\(benefit)		303	(103)	(434)	80
Net earnings		$ 3,314	$ 692	$ 6,261	$ 2,726
Earnings per common share
Basic (in usd per share)	[1]	$ 0.10	$ 0.02	$ 0.19	$ 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)		33,337,000	32,489,000	33,195,000	32,414,000
Diluted (in shares)		34,685,000	32,896,000	34,448,000	32,919,000
Class A Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.10	$ 0.02	$ 0.19	$ 0.08
Diluted (in usd per share)	[1]	$ 0.10	$ 0.02	$ 0.18	$ 0.08
Shares used in the calculation of earnings per common share
Basic (in shares)		31,515,000	30,667,000	31,373,000	30,592,000
Diluted (in shares)		34,685,000	32,896,000	34,448,000	32,919,000
Class B Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.10	$ 0.02	$ 0.19	$ 0.08
Diluted (in usd per share)		$ 0.10	$ 0.02	$ 0.19	$ 0.09
Shares used in the calculation of earnings per common share
Basic (in shares)		1,822,000	1,822,000	1,822,000	1,822,000
Diluted (in shares)		1,822,000	1,822,000	1,822,000	1,822,000
Subscription Fees
Revenues:
Revenues		$ 10,361	$ 6,966	$ 20,149	$ 13,329
Cost of revenues:
Cost of revenues		3,404	2,946	6,628	5,705
License
Revenues:
Revenues		805	450	1,297	1,237
Cost of revenues:
Cost of revenues		198	553	357	1,228
Professional Services and Other
Revenues:
Revenues		10,779	10,242	20,308	20,056
Cost of revenues:
Cost of revenues		7,477	7,624	14,487	15,454
Maintenance
Revenues:
Revenues		9,266	10,223	18,728	20,537
Cost of revenues:
Cost of revenues		$ 1,746	$ 1,941	$ 3,720	$ 3,714

[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 $0.10 and $0.02 for the three months ended October 31, 2021 and 2020 and $0.19 and $0.09 for the six months ended October 31, 2021 and 2020. See Note D to the Condensed Consolidated Financial Statements.