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Note 13 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based compensation expense | $ 1,709 | $ 281 | $ 1,200
Cost of Sales [Member] |  |  |
Share-based compensation expense | 383 | 12 | 292
Selling, General and Administrative Expenses [Member] |  |  |
Share-based compensation expense | $ 1,326 | $ 269 | $ 908

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