Note 9 - Income Taxes - Liability for Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Liability for uncertain tax positions	$ 29,061	$ 28,951
Additions based on tax positions related to the current year	764	1,738
Translation adjustment	887
Translation adjustment		(211)
Settlement/expiration of statutes of limitations	(2,196)	(1,417)
Liability for uncertain tax positions	$ 28,516	$ 29,061