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Note 10 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock compensation expense | $ 13,956 | $ 5,981 | $ 3,043
Research and Development Expense [Member] |  |  |
Stock compensation expense | 1,906 | 1,012 | 571
Selling and Marketing Expense [Member] |  |  |
Stock compensation expense | 1,788 | 852 | 711
General and Administrative Expense [Member] |  |  |
Stock compensation expense | 8,061 | 3,518 | 1,584
Cost of Sales [Member] |  |  |
Stock compensation expense | $ 2,201 | $ 599 | $ 177

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