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Note 15 - Stockholders' Equity - Summarizes Employee Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation expense	$ 3,485	$ 1,922
Cost of Sales [Member]
Stock-based compensation expense	40	66
Research and Development Expense [Member]
Stock-based compensation expense	642	333
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	$ 2,803	$ 1,522

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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-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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