Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 28, 2013		Sep. 29, 2012		Sep. 28, 2013		Sep. 29, 2012
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	$ 201,040	[1]	$ 172,688	[1]	$ 559,724	[1]	$ 509,119	[1]
United States [Member]
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	76,183	[1]	56,043	[1]	202,731	[1]	170,653	[1]
China [Member]
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	43,644	[1]	39,282	[1]	114,952	[1]	107,409	[1]
Other Countries [Member]
Note 12 - Business Unit Segment Information (Details) - Net Sales by Geographical Area [Line Items]
Net sales	$ 81,213	[1]	$ 77,363	[1]	$ 242,041	[1]	$ 231,057	[1]

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