Note 7 - Segment and Geographic Information (Details) - Revenue by Region - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	$ 81,416	$ 68,436	$ 154,954	$ 128,497
CHINA
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	53,450	43,931	99,252	80,789
TAIWAN, PROVINCE OF CHINA
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	10,143	9,638	21,172	18,701
Europe [Member]
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	5,317	4,574	10,432	9,165
KOREA, REPUBLIC OF
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	5,109	3,890	9,354	6,626
South East Asia [Member]
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	3,336	1,407	7,075	3,421
JAPAN
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	2,412	1,713	4,297	3,854
UNITED STATES
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	1,566	3,231	3,259	5,834
Other Region [Member]
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	$ 83	$ 52	$ 113	$ 107