v3.8.0.1

Note 12 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based compensation expense | $ 4,294 | $ 4,479 | $ 5,010
Cost of Sales [Member] |  |  |
Stock-based compensation expense | 324 | 302 | 67
Research and Development Expense [Member] |  |  |
Stock-based compensation expense | 1,901 | 2,308 | 2,587
General and Administrative Expense [Member] |  |  |
Stock-based compensation expense | $ 2,069 | $ 1,869 | $ 2,356

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