Note 13 - Business Unit Segment Information (Detail) - Net Sales by Geographical Area (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013		Mar. 31, 2012
Net sales	$ 170,918	[1]	$ 160,578	[1]
United States [Member]
Net sales	57,914	[1]	55,253	[1]
China [Member]
Net sales	33,614	[1]	30,444	[1]
Other Countries [Member]
Net sales	$ 79,390	[1]	$ 74,881	[1]

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