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Note 11 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Stock compensation expense | $ 3,043 | $ 1,519
Research and Development Expense [Member] |  |
Stock compensation expense | 571 | 260
Selling and Marketing Expense [Member] |  |
Stock compensation expense | 711 | 269
General and Administrative Expense [Member] |  |
Stock compensation expense | 1,584 | 809
Cost of Sales [Member] |  |
Stock compensation expense | $ 177 | $ 181

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