Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Total revenues	$ 114,117,000	$ 99,123,000	$ 103,729,000
Total cost of revenues	66,356,000	60,517,000	63,898,000
Gross profit	47,761,000	38,606,000	39,831,000
Operating expenses:
Selling, general and administrative	44,383,000	38,471,000	37,400,000
Research and development	8,597,000	7,819,000	7,945,000
Amortization of intangible assets	757,000	275,000	88,000
Total operating expenses	53,737,000	46,565,000	45,433,000
Operating loss	(5,976,000)	(7,959,000)	(5,602,000)
Non-operating income (expense):
Other income (expense), net	297,000	50,000	(16,000)
Interest income, net	229,000	129,000	32,000
Loss from continuing operations before income taxes	(5,450,000)	(7,780,000)	(5,586,000)
(Provision) benefit for income taxes	(160,000)	(36,000)	1,818,000
Loss from continuing operations	(5,610,000)	(7,816,000)	(3,768,000)
Gain on sale of discontinued operation, net of tax			242,000
Net loss	$ (5,610,000)	$ (7,816,000)	$ (3,526,000)
Loss per share from continuing operations-basic and diluted	$ (0.14)	$ (0.23)	$ (0.12)
Gain per share from sale of discontinued operation-basic and diluted			0.01
Net loss per share-basic and diluted	$ (0.14)	$ (0.23)	$ (0.11)
Shares used in basic per share calculations (in shares)	39,012	33,266	32,776
Shares used in diluted per share calculations (in shares)	39,012	33,266	32,776
Product
Total revenues	$ 55,007,000	$ 48,227,000	$ 46,464,000
Total cost of revenues	30,266,000	28,434,000	26,633,000
Service
Total revenues	59,110,000	50,896,000	57,265,000
Total cost of revenues	$ 36,090,000	$ 32,083,000	$ 37,265,000