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Note 6 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based compensation | $ 650 | $ 239 | $ 1,771 | $ 1,338
Common Stock [Member] |  |  |  |
Share-based compensation | 100 | 100 | 300 | 300
Employee and Nonemployee Stock Option [Member] |  |  |  |
Share-based compensation | 52 | 59 | 157 | 173
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based compensation | $ 498 | $ 80 | $ 1,314 | $ 865

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