Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014		Mar. 30, 2013
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	$ 206,859	[1]	$ 170,918	[1]
UNITED STATES
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	71,874	[1]	57,914	[1]
CHINA
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	37,213	[1]	33,614	[1]
Other Countries [Member]
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	$ 97,772	[1]	$ 79,390	[1]

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