Note 7 - Segment, Significant Customers and Geographic Information - Long Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Long lived assets by region	$ 297,741	$ 281,528
CHINA
Long lived assets by region	167,625	151,752
UNITED STATES
Long lived assets by region	101,891	101,768
TAIWAN, PROVINCE OF CHINA
Long lived assets by region	18,435	18,797
Other Region [Member]
Long lived assets by region	$ 9,790	$ 9,211