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Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Total stock-based compensation expense	$ 1,033	$ 1,292
Cost of Sales [Member]
Total stock-based compensation expense	29	91
Research and Development Expense [Member]
Total stock-based compensation expense	179	247
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	$ 825	$ 954

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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X

- Details

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