Note 11 - Net Sales by Geographical Area (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 02, 2016	Mar. 28, 2015
UNITED STATES
Revenue, Net	[1]	$ 85,149	$ 83,373
CHINA
Revenue, Net	[1]	48,509	44,429
Other Countries [Member]
Revenue, Net	[1]	85,740	82,511
Revenue, Net	[1]	$ 219,398	$ 210,313

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