Note 6 - Segment Information (Detail) - Revenue By Region (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue By Region	$ 58,607	$ 51,628	$ 109,091	$ 96,096
China [Member]
Revenue By Region	35,091	31,203	64,184	54,880
Taiwan [Member]
Revenue By Region	7,820	5,156	14,235	10,285
Korea [Member]
Revenue By Region	2,600	4,417	4,559	8,844
Europe [Member]
Revenue By Region	3,793	3,567	7,983	7,042
Japan [Member]
Revenue By Region	2,355	2,740	4,661	5,718
United States [Member]
Revenue By Region	1,601	860	2,713	1,966
Other Region [Member]
Revenue By Region	$ 5,347	$ 3,685	$ 10,756	$ 7,361