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Note 12 - Income Taxes - Summary of Tax Credit Carryforwards (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Research Tax Credit Carryforward [Member] | Domestic Tax Jurisdiction [Member]
Tax credit carryforwards	$ 0	$ 0
Research Tax Credit Carryforward [Member] | State and Local Jurisdiction [Member]
Tax credit carryforwards	$ 3,492	$ 3,181
Tax credit carryforwards, expiration date	Mar. 31, 2036	Mar. 31, 2036
Research Tax Credit Carryforward [Member] | Foreign Tax Jurisdiction [Member]
Tax credit carryforwards	$ 15	$ 15
Foreign Tax Credit Carryforwards [Member] | Domestic Tax Jurisdiction [Member]
Tax credit carryforwards, expiration date	Mar. 31, 2037	Mar. 31, 2037

X

- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

+ Details

Name:	us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Expiration date of the tax credit carryforward, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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X

- Details

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X

- Details

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X

- Details

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