Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Total revenues	$ 117,138	$ 107,403	$ 93,307
Cost of revenues	70,282	63,790	58,045
Gross profit	46,856	43,613	35,262
Operating expenses:
Selling, general and administrative	39,164	40,665	34,166
Research and development	5,130	4,315	3,755
Amortization of intangible assets	1,504	757	275
Restructuring charges	619	0	0
Total operating expenses	46,417	45,737	38,196
Operating income (loss)	439	(2,124)	(2,934)
Non-operating income:
Other income, net	54	297	49
Interest income, net	113	229	128
Income (loss) from continuing operations before income taxes	606	(1,598)	(2,757)
Provision for income taxes	(115)	(160)	(36)
Net income (loss) from continuing operations	491	(1,758)	(2,793)
Loss from discontinued operations before gain on sale, net of tax	(1,654)	(3,852)	(5,023)
Gain on sale of discontinued operations, net of tax	11,297	0	0
Net income (loss) from discontinued operations, net of tax	9,643	(3,852)	(5,023)
Net income (loss)	$ 10,134	$ (5,610)	$ (7,816)
Income (loss) per share - basic:
Income (loss) per share from continuing operations (in dollars per share)	$ 0.01	$ (0.04)	$ (0.08)
Income (loss) per share from discontinued operations (in dollars per share)	0.23	(0.10)	(0.15)
Net income (loss) per share (in dollars per share)	0.24	(0.14)	(0.23)
Income (loss) per share - diluted:
Income (loss) per share from continuing operations (in dollars per share)	0.01	(0.04)	(0.08)
Income (loss) per share from discontinued operations (in dollars per share)	0.23	(0.10)	(0.15)
Net income (loss) per share (in dollars per share)	$ 0.24	$ (0.14)	$ (0.23)
Shares used in basic per share calculations	41,176,000	39,012,000	33,266,000
Shares used in diluted per share calculations	41,599,000	39,012,000	33,266,000
Product revenues
Total revenues	$ 62,933	$ 55,007	$ 48,227
Cost of revenues	34,933	30,266	28,434
Service revenues
Total revenues	54,205	52,396	45,080
Cost of revenues	$ 35,349	$ 33,524	$ 29,611