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Note 7 - Share-based Compensation - Stock Compensation Expense (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
Stock compensation expense | $ 1,145 | $ 818 | $ 2,258 | $ 1,349
Research and Development Expense [Member] |  |  |  |
Stock compensation expense | 222 | 168 | 397 | 235
Selling and Marketing Expense [Member] |  |  |  |
Stock compensation expense | 96 | 171 | 325 | 326
General and Administrative Expense [Member] |  |  |  |
Stock compensation expense | 699 | 439 | 1,275 | 716
Cost of Sales [Member] |  |  |  |
Stock compensation expense | $ 128 | $ 40 | $ 261 | $ 72

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