Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 28, 2014		Jun. 29, 2013		Jun. 28, 2014	Jun. 29, 2013
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	$ 220,908	[1]	$ 187,766	[1]	$ 427,767	$ 358,684
UNITED STATES
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	80,492	[1]	68,633	[1]	152,366	126,547
CHINA
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	39,987	[1]	37,694	[1]	77,200	71,308
Other Countries [Member]
Note 11 - Business Unit Segment Information (Details) - Net Sales by Geographic Area [Line Items]
Net sales	$ 100,429	[1]	$ 81,439	[1]	$ 198,201	$ 160,829

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