Note 5 - Segment Information (Details) - Revenue By Region (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	$ 60,061	$ 51,470
CHINA
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	36,859	26,779
TAIWAN, PROVINCE OF CHINA
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	9,064	7,519
Europe [Member]
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	4,591	3,950
KOREA, REPUBLIC OF
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,736	2,418
UNITED STATES
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,603	1,901
JAPAN
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,141	1,521
South East Asia [Member]
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,013	7,329
Other Region [Member]
Note 5 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	$ 54	$ 53