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11. STOCK-BASED COMPENSATION - Stock-based compensation expense (Details) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Stock-based compensation expense by line item
Stock-based compensation expense	$ 2,854,000	$ 2,566,000	$ 2,266,000
Cost of revenues
Stock-based compensation expense by line item
Stock-based compensation expense	346,000	257,000	234,000
Research and development
Stock-based compensation expense by line item
Stock-based compensation expense	1,509,000	1,487,000	1,310,000
Selling, general and administrative
Stock-based compensation expense by line item
Stock-based compensation expense	999,000	822,000	722,000
2007 Employee Stock Purchase Plan
Stock-based compensation expense by line item
Stock-based compensation expense	$ 276,000	$ 220,000	$ 211,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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