Note 7 - Segment and Geographic Information - Long Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Long lived assets by region	$ 184,802	$ 180,238
CHINA
Long lived assets by region	92,066	89,472
UNITED STATES
Long lived assets by region	68,014	65,618
TAIWAN, PROVINCE OF CHINA
Long lived assets by region	17,033	17,238
BERMUDA
Long lived assets by region	6,879	7,522
Other Region [Member]
Long lived assets by region	$ 810	$ 388