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Note 9 - Capital Stock and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based compensation | $ 1,079 | $ 987 | $ 2,641 | $ 2,193
Continuing Operations [Member] | Cost of Sales [Member] |  |  |  |
Share-based compensation | 19 | 13 | 43 | 34
Continuing Operations [Member] | Selling and Marketing Expense [Member] |  |  |  |
Share-based compensation | 92 | 39 | 205 | 68
Continuing Operations [Member] | General and Administrative Expense [Member] |  |  |  |
Share-based compensation | 908 | 895 | 2,249 | 1,975
Continuing Operations [Member] | Research and Development Expense [Member] |  |  |  |
Share-based compensation | $ 60 | $ 40 | $ 144 | $ 116

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