Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total revenues	$ 27,882,000	$ 24,417,000	$ 54,489,000	$ 49,892,000
Total cost of revenues	16,498,000	14,756,000	32,698,000	30,039,000
Gross profit	11,384,000	9,661,000	21,791,000	19,853,000
Operating expenses:
Selling, general and administrative	11,518,000	9,080,000	21,586,000	18,710,000
Research and development	1,986,000	1,912,000	3,830,000	4,001,000
Amortization of intangible assets	231,000	65,000	297,000	130,000
Total operating expenses	13,735,000	11,057,000	25,713,000	22,841,000
Operating loss	(2,351,000)	(1,396,000)	(3,922,000)	(2,988,000)
Non-operating income:
Other income, net	117,000	18,000	107,000	33,000
Interest income	48,000	41,000	81,000	80,000
Loss from operations before income taxes	(2,186,000)	(1,337,000)	(3,734,000)	(2,875,000)
Provision for income taxes	(1,000)	(4,000)	(25,000)	(45,000)
Net loss	$ (2,187,000)	$ (1,341,000)	$ (3,759,000)	$ (2,920,000)
Net loss per share - basic and diluted (in dollars per share)	$ (0.05)	$ (0.04)	$ (0.10)	$ (0.09)
Shares used in basic per share calculations (in shares)	40,493	33,242	37,397	33,221
Shares used in diluted per share calculations (in shares)	40,493	33,242	37,397	33,221
Product
Total revenues	$ 13,795,000	$ 12,412,000	$ 28,312,000	$ 24,330,000
Total cost of revenues	7,551,000	6,902,000	16,046,000	13,396,000
Service
Total revenues	14,087,000	12,005,000	26,177,000	25,562,000
Total cost of revenues	$ 8,947,000	$ 7,854,000	$ 16,652,000	$ 16,643,000