Note 7 - Segment and Geographic Information (Details) - Revenue by Region (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	$ 73,538	$ 60,061
CHINA
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	45,802	36,859
TAIWAN, PROVINCE OF CHINA
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	11,029	9,064
Europe [Member]
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	5,115	4,591
KOREA, DEMOCRATIC PEOPLE'S REPUBLIC OF
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	4,245	2,736
South East Asia [Member]
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	3,739	2,013
JAPAN
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	1,885	2,141
UNITED STATES
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	1,693	2,603
Other Region [Member]
Note 7 - Segment and Geographic Information (Details) - Revenue by Region [Line Items]
Region	$ 30	$ 54