Note 15 - Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Domestic	$ 58,551	$ 74,841	$ 81,893
Foreign	4,394	6,352	9,762
Income before income taxes	$ 62,945	$ 81,193	$ 91,655