Note 7 - Segment, Significant Customers and Geographic Information - Long Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Long lived assets by region	$ 270,310	$ 228,315
CHINA
Long lived assets by region	143,848	113,888
UNITED STATES
Long lived assets by region	101,884	94,671
TAIWAN, PROVINCE OF CHINA
Long lived assets by region	18,122	17,652
Other Region [Member]
Long lived assets by region	$ 6,456	$ 2,104