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Note 13 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unrecognized tax benefits at beginning of period $ 2,555 $ 2,401 $ 2,332
Gross increases – tax positions in current year 504 619 429
Reductions due to lapse of statute of limitations (670) (465) (360)
Unrecognized tax benefits at end of period $ 2,389 $ 2,555 $ 2,401