Note 12 - Segment and Geographic Information - Net Sales by Geographical Area (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 02, 2016	Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
UNITED STATES
Revenue, Net	[1]	$ 93,036	$ 89,608	$ 178,184	$ 172,981
CHINA
Revenue, Net	[1]	62,411	49,920	110,919	94,349
Other Countries [Member]
Revenue, Net	[1]	116,465	82,493	202,207	165,004
Revenue, Net	[1]	$ 271,912	$ 222,021	$ 491,310	$ 432,334

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