Note 6 - Segment Information (Details) - Revenue By Region (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	$ 57,714	$ 58,607	$ 109,184	$ 109,091
China [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	34,743	35,091	61,522	64,184
Taiwan [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	8,321	7,820	15,840	14,235
Europe [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	3,327	3,793	7,277	7,983
Korea [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,408	2,600	4,826	4,559
United States [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	1,839	1,601	3,740	2,713
Japan [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	1,640	2,355	3,161	4,661
Rest of Asia [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	5,385	5,295	12,714	10,349
Other Region [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	$ 51	$ 52	$ 104	$ 407