Note 10 - Summary of Stock Options - Stock-based Compensation Expense Included in the Statement of Income (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Stock-based compensation expense | $ 3,035 | $ 1,872 |
| Cost of Sales [Member] | ||
| Stock-based compensation expense | 69 | 19 |
| Research and Development Expense [Member] | ||
| Stock-based compensation expense | 328 | 252 |
| Selling, General and Administrative Expenses [Member] | ||
| Stock-based compensation expense | $ 2,638 | $ 1,601 |
| 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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