Note 13 - Business Unit Segment Information (Detail) - Net Sales by Geographical Area (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 29, 2012		Oct. 01, 2011		Sep. 29, 2012		Oct. 01, 2011
Net sales	$ 172,688	[1]	$ 173,987	[1]	$ 509,119	[1]	$ 517,762	[1]
United States [Member]
Net sales	56,043		56,225		170,653		174,895
China [Member]
Net sales	39,282		41,159		107,409		116,694
Other Countries [Member]
Net sales	$ 77,363		$ 76,603		$ 231,057		$ 226,173

[1] Sales by country represent sales to customer or distributor locations.