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Note 3 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Total stock-based compensation expense	$ 1,357	$ 1,033
Cost of Sales [Member]
Total stock-based compensation expense	109	29
Research and Development Expense [Member]
Total stock-based compensation expense	156	179
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	$ 1,092	$ 825

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
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Details

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