Note 7 - Segment, Significant Customers and Geographic Information - Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 165,778	$ 141,363
CHINA
Revenue	105,737	76,198
TAIWAN, PROVINCE OF CHINA
Revenue	16,540	21,347
Europe [Member]
Revenue	13,072	12,984
KOREA, REPUBLIC OF
Revenue	10,944	9,611
South East Asia [Member]
Revenue	8,780	8,672
JAPAN
Revenue	6,890	6,642
UNITED STATES
Revenue	3,737	5,806
Other Region [Member]
Revenue	$ 78	$ 103