Note 17 - Segment Reporting - Expenditures for Additions to Long-lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Expenditures for additions to long-lived assets	$ 47,010	$ 62,230	$ 87,104
UNITED STATES
Expenditures for additions to long-lived assets	29,984	45,123	78,762
Europe [Member]
Expenditures for additions to long-lived assets	16,574	14,743	7,576
JAPAN
Expenditures for additions to long-lived assets	$ 452	$ 2,364	$ 766