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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 | 9 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Total stock-based compensation expense | $ 1,140 | $ 1,440 | $ 3,608 | $ 3,492
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 62 | 89 | 230 | 195
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 158 | 214 | 469 | 570
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 920 | $ 1,137 | $ 2,909 | $ 2,727

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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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