Note 6 - Segment Information (Detail) - Revenue By Region (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue By Region	$ 51,470	$ 50,484
China [Member]
Revenue By Region	26,779	29,093
Taiwan [Member]
Revenue By Region	7,519	6,415
Europe [Member]
Revenue By Region	3,950	4,190
Japan [Member]
Revenue By Region	1,521	2,306
Korea [Member]
Revenue By Region	2,418	1,959
United States [Member]
Revenue By Region	1,901	1,112
Rest of Asia [Member]
Revenue By Region	7,329	5,054
Other Region [Member]
Revenue By Region	$ 53	$ 355