Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 29, 2013		Jun. 30, 2012		Jun. 29, 2013		Jun. 30, 2012
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	$ 187,766	[1]	$ 175,853	[1]	$ 358,684	[1]	$ 336,431	[1]
United States [Member]
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	68,633	[1]	59,370	[1]	126,547	[1]	114,610	[1]
China [Member]
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	37,694	[1]	37,677	[1]	71,308	[1]	68,127	[1]
Other Countries [Member]
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	$ 81,439	[1]	$ 78,806	[1]	$ 160,829	[1]	$ 153,694	[1]

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