Note 6 - Segment Information (Details) - Revenue By Region (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	$ 65,347	$ 56,508	$ 174,531	$ 165,599
China [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	40,577	31,023	102,099	95,207
Taiwan [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	8,886	7,579	24,726	21,814
Europe [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	3,949	5,004	11,226	12,987
Korea [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,599	3,022	7,425	7,581
Japan [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	2,285	2,029	5,446	6,690
United States [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	1,812	1,437	5,552	4,150
Rest of Asia [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	5,103	6,309	17,817	16,658
Other Region [Member]
Note 6 - Segment Information (Details) - Revenue By Region [Line Items]
Revenue By Region	$ 136	$ 105	$ 240	$ 512