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Note 12 - Income Taxes - Summary of Tax Credit Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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
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- 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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- Details
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