Note 10 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Balance at beginning of year | $ 120 | $ 120 | $ 120 |
Additions for tax positions of prior years | |||
Additions based on tax positions related to current year | 2,265 | ||
Balance at end of year | $ 2,385 | $ 120 | $ 120 |