Note 11 - Research and Development (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Statement Line Items [Line Items] | |||
| Research and Development Expense, Option Fee | $ 1,000 | ||
| X | ||||||||||
- Definition Amount of option fee incurred related to research and development. No definition available.
|
| X | ||||||||||
- References No definition available.
|