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Note 17 - Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unrecognized income tax benefits, beginning of year $ 4,116 $ 4,874 $ 4,874
Decreases for lapse in statute of limitations (520)
Decreases for positions taken in prior years (238)
Increases for positions taken in the current year 234
Unrecognized income tax benefits, end of year $ 4,350 $ 4,116 $ 4,874