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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 92
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	$ 0	$ 0
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Subject to Section 382	1,513
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member]
Operating Loss Carryforwards, Subject to Section 382	$ 1,360

X

- Definition

Amount of operating loss carryforwards subject to Section 382.

+ References

No definition available.

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X

- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A

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