Note 9 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Stock-based compensation expense | $ 776 | $ 455 | $ 1,529 | $ 827 |
| Cost of Sales [Member] | ||||
| Stock-based compensation expense | 17 | 4 | 28 | 7 |
| Research and Development Expense [Member] | ||||
| Stock-based compensation expense | 65 | 57 | 187 | 108 |
| Selling, General and Administrative Expenses [Member] | ||||
| Stock-based compensation expense | $ 694 | $ 394 | $ 1,314 | $ 712 |
| X | ||||||||||
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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