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Note 8 - Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Total share-based compensation expense | $ 1,201 | $ 1,281 | $ 2,432 | $ 3,678
Share-based compensation capitalized in intangible assets | 30 | 47 | 71 | 86
Total share-based compensation | 1,231 | 1,328 | 2,503 | 3,764
Selling and Marketing Expense [Member] |  |  |  |
Total share-based compensation expense | 209 | 269 | 372 | 487
Research and Development Expense [Member] |  |  |  |
Total share-based compensation expense | 233 | 286 | 501 | 523
General and Administrative Expense [Member] |  |  |  |
Total share-based compensation expense | $ 759 | $ 726 | $ 1,559 | $ 2,668

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