Note 12 - Summary of Quarterly Financial Data (Details) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 26, 2015	[1]	Sep. 26, 2015	[1]	Jun. 27, 2015	[1]	Mar. 28, 2015	[1]	Dec. 27, 2014	[1]	Sep. 27, 2014	[1]	Jun. 28, 2014	[1]	Mar. 29, 2014	[1]	Dec. 26, 2015	Dec. 27, 2014
Net sales	$ 63,484		$ 67,512		$ 75,211		$ 63,447		$ 90,587		$ 91,573		$ 74,299		$ 60,170		$ 269,654	$ 316,629
Gross profit	20,397		22,794		25,702		20,145		28,727		32,952		24,263		20,030		89,038	105,972
Income (loss) from continuing operations	2,290		1,335		3,887		(1,720)		5,275		10,012		2,200		(2,707)		5,792	14,780
Net loss	$ 1,949		$ 1,113		$ (72)		$ (2,740)		$ 374		$ 7,519		$ 4,163		$ (3,348)		$ 250	$ 8,708
Income (loss) from continuing operations (in dollars per share)	$ 0.09	[2]	$ 0.05	[2]	$ 0.15	[2]	$ (0.07)	[2]	$ 0.21	[2]	$ 0.39	[2]	$ 0.09	[2]	$ (0.11)	[2]	$ 0.22	$ 0.58
Net income (loss) (in dollars per share)	0.07	[2]	0.04	[2]	0	[2]	(0.11)	[2]	0.01	[2]	0.30	[2]	0.16	[2]	(0.13)	[2]	0.01	0.34
Income (loss) from continuing operations (in dollars per share)	0.08	[2]	0.05	[2]	0.15	[2]	(0.07)	[2]	0.20	[2]	0.38	[2]	0.09	[2]	(0.11)	[2]	0.22	0.57
Net income (loss) (in dollars per share)	$ 0.07	[2]	$ 0.04	[2]	$ 0	[2]	$ (0.11)	[2]	$ 0.01	[2]	$ 0.29	[2]	$ 0.16	[2]	$ (0.13)	[2]	$ 0.01	$ 0.33

[1] All quarters presented above were comprised of 13 weeks.

[2] The sum of the four quarters may not agree to the year total due to rounding within a quarter and the inclusion or exclusion of common stock equivalents.