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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