Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Revenues:
Revenues		$ 30,600	$ 27,003	$ 86,193	$ 82,435
Cost of revenues:
Cost of revenues		13,158	12,964	38,943	39,977
Gross margin		17,442	14,039	47,250	42,458
Research and development		3,853	2,811	11,390	9,818
Sales and marketing		5,519	4,699	16,246	15,183
General and administrative		5,194	4,302	14,923	12,903
Amortization of acquisition-related intangibles		57	97	232	291
Total operating expenses		14,623	11,909	42,791	38,195
Operating income		2,819	2,130	4,459	4,263
Other income:
Interest income		360	523	1,234	1,551
Other, net		618	4	981	(461)
Earnings before income taxes		3,797	2,657	6,674	5,353
Income tax expense		511	356	477	424
Net earnings		$ 3,286	$ 2,301	$ 6,197	$ 4,929
Earnings per common share
Basic (in usd per share)	[1]	$ 0.10	$ 0.07	$ 0.20	$ 0.16
Diluted (in usd per share)	[1]	0.10	0.07	0.19	0.16
Cash dividends declared per common share (in usd per share)		$ 0.11	$ 0.11	$ 0.33	$ 0.33
Shares used in the calculation of earnings per common share
Basic (in shares)		31,955	31,010	31,611	30,887
Diluted (in shares)		32,668	31,183	32,260	31,351
Class B Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.10	$ 0.07	$ 0.20	$ 0.16
Diluted (in usd per share)		$ 0.10	$ 0.07	$ 0.20	$ 0.16
Shares used in the calculation of earnings per common share
Basic (in shares)		1,822	1,822	1,822	1,851
Diluted (in shares)		1,822	1,822	1,822	1,851
Subscription Fees
Revenues:
Revenues		$ 5,802	$ 3,687	$ 15,752	$ 10,196
Cost of revenues:
Cost of revenues		1,976	1,389	6,711	3,746
License
Revenues:
Revenues		3,695	1,718	6,519	5,432
Cost of revenues:
Cost of revenues		1,582	1,831	3,969	5,305
Professional Services and Other
Revenues:
Revenues		10,308	10,176	31,271	32,240
Cost of revenues:
Cost of revenues		7,764	7,714	22,712	24,484
Maintenance
Revenues:
Revenues		10,795	11,422	32,651	34,567
Cost of revenues:
Cost of revenues		$ 1,836	$ 2,030	$ 5,551	$ 6,442

[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 $0.10 and $0.07 for the three months ended January 31, 2020 and 2019, and $0.20 and $0.16 for the nine months ended January 31, 2020 and 2019 respectively. See Note E to the Condensed Consolidated Financial Statements.