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Note 8 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock compensation expense | $ 4,868 | $ 1,560 | $ 8,892 | $ 3,818
Research and Development Expense [Member] |  |  |  |
Stock compensation expense | 551 | 291 | 1,171 | 687
Selling and Marketing Expense [Member] |  |  |  |
Stock compensation expense | 560 | 256 | 1,012 | 581
General and Administrative Expense [Member] |  |  |  |
Stock compensation expense | 3,015 | 868 | 5,662 | 2,144
Cost of Sales [Member] |  |  |  |
Stock compensation expense | $ 742 | $ 145 | $ 1,047 | $ 406

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