Note 9 - Income Taxes - Liability for Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Liability for uncertain tax positions	$ 28,951	$ 30,430
Additions based on tax positions related to the current year	1,738	1,703
Translation adjustment	211	657
Settlement/expiration of statutes of limitations	(1,417)	(2,525)
Liability for uncertain tax positions	$ 29,061	$ 28,951