Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2018
Revenues:
Total revenues		$ 115,466	$ 108,706	$ 112,703
Cost of revenues:
Cost of revenues		52,308	51,966	50,000
Gross margin		63,158	56,740	62,703
Research and development		15,348	13,078	11,877
Sales and marketing		21,958	20,992	20,658
General and administrative		19,519	17,006	16,057
Amortization of acquisition-related intangibles		285	388	580
Total operating expenses		57,110	51,464	49,172
Operating income		6,048	5,276	13,531
Other income:
Interest income		1,524	2,092	1,575
Other, net		(774)	273	609
Earnings before income taxes		6,798	7,641	15,715
Income tax expense		56	838	3,662
Net earnings		$ 6,742	$ 6,803	$ 12,053
Earnings per common share
Basic (in usd per share)	[1]	$ 0.21	$ 0.22	$ 0.40
Diluted (in usd per share)		$ 0.21	$ 0.22	$ 0.40
Shares used in the calculation of earnings per common share:
Basic (in shares)		31,747	30,950	30,080
Diluted (in shares)		32,367	31,378	30,472
Subscriptions fees
Revenues:
Total revenues		$ 22,033	$ 14,026	$ 8,855
Cost of revenues:
Cost of revenues		9,491	5,759	3,817
License
Revenues:
Total revenues		7,582	7,126	15,344
Cost of revenues:
Cost of revenues		4,798	6,430	6,261
Professional services and other
Revenues:
Total revenues		42,774	42,154	44,663
Cost of revenues:
Cost of revenues		30,695	31,421	30,596
Maintenance
Revenues:
Total revenues		43,077	45,400	43,841
Cost of revenues:
Cost of revenues		$ 7,324	$ 8,356	$ 9,326
Class A Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.21	$ 0.22	$ 0.40
Diluted (in usd per share)	[1]	$ 0.21	$ 0.22	$ 0.40
Shares used in the calculation of earnings per common share:
Basic (in shares)		29,925	29,106	27,805
Diluted (in shares)		32,367	31,379	30,472
Class B Common Shares
Earnings per common share
Basic (in usd per share)		$ 0.21	$ 0.22	$ 0.39
Diluted (in usd per share)		$ 0.22	$ 0.22	$ 0.39
Shares used in the calculation of earnings per common share:
Basic (in shares)		1,822	1,844	2,275
Diluted (in shares)		1,822	1,844	2,275

[1] Diluted per share amounts for Class A shares are shown above. Diluted per share for Class B shares under the two-class method are $0.22, $0.22 and $0.39 for the years ended April 30, 2020, 2019 and 2018, respectively. See Note 1 to the Consolidated Financial Statements.