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Note 8 - Capital Stock and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation | $ 1,004 | $ 1,079 | $ 3,136 | $ 2,641
Continuing Operations [Member] | Cost of Sales [Member] |  |  |  |
Share-based compensation | 32 | 19 | 83 | 43
Continuing Operations [Member] | Selling and Marketing Expense [Member] |  |  |  |
Share-based compensation | 149 | 92 | 373 | 205
Continuing Operations [Member] | General and Administrative Expense [Member] |  |  |  |
Share-based compensation | 790 | 908 | 2,593 | 2,249
Continuing Operations [Member] | Research and Development Expense [Member] |  |  |  |
Share-based compensation | $ 33 | $ 60 | $ 87 | $ 144

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