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Note 10 - Common Stock and Stock-based Compensation Plans - Equity-based Compensation Expense Included in Interim Condensed Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Total equity-based compensation expense | $ 2,416 | $ 2,771
Cost of Revenues [Member] |  |
Total equity-based compensation expense | 136 | 157
Research and Development, Net [Member] |  |
Total equity-based compensation expense | 1,362 | 1,269
Sales and Marketing [Member] |  |
Total equity-based compensation expense | 356 | 454
General and Administrative [Member] |  |
Total equity-based compensation expense | $ 562 | $ 891

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