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Note 4 - Stock-based Compensation - Stock-based Compensation Expense by Financial Statement Line Item (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Total stock-based compensation expense | $ 1,440 | $ 1,120 | $ 3,492 | $ 3,513
Cost of Sales [Member] |  |  |  |
Total stock-based compensation expense | 89 | 36 | 195 | 148
Research and Development Expense [Member] |  |  |  |
Total stock-based compensation expense | 214 | 190 | 570 | 629
Selling, General and Administrative Expenses [Member] |  |  |  |
Total stock-based compensation expense | $ 1,137 | $ 894 | $ 2,727 | $ 2,736

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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