Note 16 - Segment and Geographic Information (Details) - Revenue By Region - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	$ 333,067	$ 282,535	$ 238,091
CHINA
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	213,119	181,050	141,400
TAIWAN, PROVINCE OF CHINA
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	41,521	38,460	34,248
Europe [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	22,603	19,830	15,351
KOREA, REPUBLIC OF
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	20,519	14,362	9,992
South East Asia [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	18,592	13,993	21,760
JAPAN
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	9,727	8,251	7,495
UNITED STATES
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	6,732	6,392	7,525
Other Region [Member]
Note 16 - Segment and Geographic Information (Details) - Revenue By Region [Line Items]
Region	$ 254	$ 197	$ 320