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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Total share-based compensation expense | $ 1,281 | $ 2,954 | $ 3,678 | $ 5,229
Share-based compensation capitalized in intangible assets | 47 | 30 | 86 | 45
Total share-based compensation | 1,328 | 2,984 | 3,764 | 5,274
Selling and Marketing Expense [Member] |  |  |  |
Total share-based compensation expense | 269 | 160 | 487 | 529
Research and Development Expense [Member] |  |  |  |
Total share-based compensation expense | 286 | 277 | 523 | 522
General and Administrative Expense [Member] |  |  |  |
Total share-based compensation expense | $ 726 | $ 2,517 | $ 2,668 | $ 4,178

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