Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Total revenues	$ 99,123,000	$ 103,729,000	$ 95,982,000
Total cost of revenues	60,517,000	63,898,000	58,580,000
Gross profit	38,606,000	39,831,000	37,402,000
Operating expenses:
Selling, general and administrative	38,471,000	37,400,000	33,313,000
Research and development	7,819,000	7,945,000	6,877,000
Amortization of intangible assets	275,000	88,000	281,000
Loss on impairment of goodwill			2,168,000
Total operating expenses	46,565,000	45,433,000	42,639,000
Operating loss	(7,959,000)	(5,602,000)	(5,237,000)
Non-operating income (expense):
Other income (expense), net	50,000	(16,000)	(7,000)
Interest income, net	129,000	32,000	13,000
Loss from continuing operations before income taxes	(7,780,000)	(5,586,000)	(5,231,000)
(Provision) benefit for income taxes	(36,000)	1,818,000	44,000
Loss from continuing operations	(7,816,000)	(3,768,000)	(5,187,000)
Gain on sale of discontinued operation, net of tax		242,000	361,000
Net income (loss)	$ (7,816,000)	$ (3,526,000)	$ (4,826,000)
Loss per share from continuing operations - basic and diluted	$ (0.23)	$ (0.12)	$ (0.16)
Gain per share from sale of discontinued operation - basic and diluted (in dollars per share)		0.01	0.01
Net loss per share - basic and diluted (in dollars per share)	$ (0.23)	$ (0.11)	$ (0.15)
Shares used in basic per share calculations (in shares)	33,266	32,776	32,174
Shares used in diluted per share calculations (in shares)	33,266	32,776	32,174
Product
Total revenues	$ 48,227,000	$ 46,464,000	$ 43,735,000
Total cost of revenues	28,434,000	26,633,000	23,877,000
Service
Total revenues	50,896,000	57,265,000	52,247,000
Total cost of revenues	$ 32,083,000	$ 37,265,000	$ 34,703,000