Note 12 - Income Taxes - Components of Income Before Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States	$ 39,286	$ (4,134)	$ (13,151)
Foreign	130,056	117,254	131,633
Income before income taxes	$ 169,342	$ 113,120	$ 118,482