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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 | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Total stock-based compensation expense | $ 1,111 | $ 1,019 | $ 2,468 | $ 2,052
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 59 | 78 | 169 | 107
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 156 | 177 | 311 | 355
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 896 | $ 764 | $ 1,988 | $ 1,590

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- 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 + Details
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