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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		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Total stock-based compensation expense	$ 1,440	$ 1,120	$ 3,492	$ 3,513
Cost of Sales [Member]
Total stock-based compensation expense	89	36	195	148
Research and Development Expense [Member]
Total stock-based compensation expense	214	190	570	629
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense	$ 1,137	$ 894	$ 2,727	$ 2,736

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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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Namespace Prefix:
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