Note 12 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal	$ 2,842	$ 1,682	$ 11,023
State	(1)	8	4
Foreign	3,814	3,105	2,992
Federal	(1,221)	(213)	(797)
Foreign	(467)	(301)	(8)
Income tax expense	$ 4,967	$ 4,281	$ 13,214