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Note 8 - Share-based Compensation - Share-based Compensation Expenses (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
Total share-based compensation expense | $ 1,145 | $ 1,170 | $ 3,577 | $ 4,848
Share-based compensation capitalized in intangible assets | 23 | 34 | 94 | 120
Total share-based compensation | 1,168 | 1,204 | 3,671 | 4,968
Selling and Marketing Expense [Member] |  |  |  |
Total share-based compensation expense | 188 | 172 | 560 | 659
Research and Development Expense [Member] |  |  |  |
Total share-based compensation expense | 167 | 291 | 668 | 814
General and Administrative Expense [Member] |  |  |  |
Total share-based compensation expense | $ 790 | $ 707 | $ 2,349 | $ 3,375

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