Note 18 - Segment Reporting - Expenditures for Additions to Long-lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expenditures for additions to long-lived assets	$ 62,230	$ 87,104	$ 32,635
UNITED STATES
Expenditures for additions to long-lived assets	45,123	78,762	20,370
Europe [Member]
Expenditures for additions to long-lived assets	14,743	7,576	11,704
JAPAN
Expenditures for additions to long-lived assets	$ 2,364	$ 766	$ 561