Note 7 - Segment, Significant Customers and Geographic Information - Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 259,422	$ 168,813	$ 611,409	$ 461,183
CHINA
Revenue	157,215	105,857	375,708	276,892
TAIWAN, PROVINCE OF CHINA
Revenue	40,782	18,547	79,644	55,912
Europe [Member]
Revenue	14,255	12,047	40,770	38,071
KOREA, REPUBLIC OF
Revenue	20,935	11,990	44,452	31,224
South East Asia [Member]
Revenue	11,854	7,904	32,256	23,698
JAPAN
Revenue	9,433	8,150	25,079	21,084
UNITED STATES
Revenue	4,880	4,225	13,298	14,044
Other Region [Member]
Revenue	$ 68	$ 93	$ 202	$ 258