Note 7 - Segment, Significant Customers and Geographic Information - Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 186,209	$ 151,007	$ 351,987	$ 292,370
CHINA
Revenue	112,756	94,837	218,493	171,035
TAIWAN, PROVINCE OF CHINA
Revenue	22,322	16,018	38,862	37,365
Europe [Member]
Revenue	13,443	13,040	26,515	26,024
KOREA, REPUBLIC OF
Revenue	12,573	9,623	23,517	19,234
South East Asia [Member]
Revenue	11,622	7,122	20,402	15,794
JAPAN
Revenue	8,756	6,292	15,646	12,934
UNITED STATES
Revenue	4,681	4,013	8,418	9,819
Other Region [Member]
Revenue	$ 56	$ 62	$ 134	$ 165