Note 16 - Segment and Geographic Information - Revenue by Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue	$ 844,452	$ 627,921	$ 582,382
CHINA
Revenue	516,519	382,740	334,726
TAIWAN, PROVINCE OF CHINA
Revenue	109,256	73,801	75,307
Europe [Member]
Revenue	56,329	49,467	49,484
KOREA, REPUBLIC OF
Revenue	64,093	43,900	41,238
South East Asia [Member]
Revenue	42,403	32,031	36,495
JAPAN
Revenue	35,461	27,812	26,853
UNITED STATES
Revenue	20,098	17,836	17,621
Other Region [Member]
Revenue	$ 293	$ 334	$ 658