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Note 7 - Share-based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Stock compensation expense | $ 1,113 | $ 531
Research and Development Expense [Member] |  |
Stock compensation expense | 174 | 67
Selling and Marketing Expense [Member] |  |
Stock compensation expense | 229 | 154
General and Administrative Expense [Member] |  |
Stock compensation expense | 577 | 278
Cost of Sales [Member] |  |
Stock compensation expense | $ 133 | $ 32

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