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Note G - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock based compensation expense | $ 911 | $ 620 | $ 3,339 | $ 1,613
Research and Development Expense [Member] |  |  |  |
Stock based compensation expense | 360 | 201 | 1,093 | 630
General and Administrative Expense [Member] |  |  |  |
Stock based compensation expense | $ 551 | $ 419 | $ 2,246 | $ 983

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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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