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Note P - Share-based Compensation - Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total share-based compensation expense | $ 12,121 | $ 13,046 | $ 11,804
Cost of Sales [Member] |  |  |
Total share-based compensation expense | 885 | 937 | 772
Research and Development Expense [Member] |  |  |
Total share-based compensation expense | 2,173 | 2,812 | 2,557
Selling and Marketing Expense [Member] |  |  |
Total share-based compensation expense | 1,115 | 1,191 | 1,070
General and Administrative Expense [Member] |  |  |
Total share-based compensation expense | $ 7,948 | $ 8,106 | $ 7,405

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