Note 8 - Segment and Geographic Information - Summary of Net Sales to Customers, Attributed to Countries (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2016	[1]	Sep. 24, 2016	[1]	Jun. 25, 2016	[1]	Mar. 26, 2016	[1]	Dec. 26, 2015	[1]	Sep. 26, 2015	[1]	Jun. 27, 2015	[1]	Mar. 28, 2015	[1]	Dec. 31, 2016		Dec. 26, 2015		Dec. 27, 2014
Net sales	$ 70,694		$ 69,259		$ 76,353		$ 65,778		$ 63,484		$ 67,512		$ 75,211		$ 63,447		$ 282,084	[1]	$ 269,654	[1]	$ 316,629
Malaysia [Member]
Net sales																	85,956		60,776		73,818
CHINA
Net sales																	60,291		52,589		51,662
UNITED STATES
Net sales																	35,204		50,704		72,266
Rest of the World [Member]
Net sales																	$ 100,633		$ 105,585		$ 118,883

[1] All quarters presented above were comprised of 13 weeks, except for the fourth quarter ended December 31, 2016 which was comprised of 14 weeks.