Note 8 - Segment and Geographic Information - Long Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Long lived assets by region	$ 205,497	$ 150,001
CHINA
Long lived assets by region	98,117	93,096
UNITED STATES
Long lived assets by region	89,720	39,054
TAIWAN, PROVINCE OF CHINA
Long lived assets by region	16,854	16,972
Other Region [Member]
Long lived assets by region	$ 806	$ 879