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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