Consolidated Statements of Shareholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balance at Dec. 28, 2013	$ 342,612,000	$ 186,376,000	$ 19,323,000	$ 116,208,000	$ 3,397,000	$ 17,308,000
Balance, shares at Dec. 28, 2013		66,528,000
Employee Stock Purchase Plan, Value	122,000	122,000	0	0	0	0
Employee Stock Purchase Plan, Shares		15,000
Exercise of options	543,000	818,000	(275,000)	0	0	0
Exercise of options, shares		124,000
Stock based compensation	831,000	0	831,000	0	0	0
Earnings (loss) from continuing operations	6,583,000	0	0	6,603,000	0	(20,000)
Earnings (loss) from discontinued operations	37,000	0	0	37,000	0	0
Currency translation adjustment	(132,000)	0	0	0	(211,000)	79,000
Change in fair value of interest rate swap, net of income taxes	(60,000)	0	0	0	(40,000)	(20,000)
Balance at Apr. 05, 2014	350,536,000	187,316,000	19,879,000	122,848,000	3,146,000	17,347,000
Balance, shares at Apr. 05, 2014		66,667,000
Balance at Jan. 03, 2015	353,328,000	190,668,000	22,490,000	129,309,000	(1,778,000)	12,639,000
Balance, shares at Jan. 03, 2015		67,074,000
Employee Stock Purchase Plan, Value	122,000	122,000	0	0	0	0
Employee Stock Purchase Plan, Shares		9,000
Exercise of options	1,494,000	2,273,000	(779,000)	0	0	0
Exercise of options, shares		394,000
Exercise of Warrants, Value	812,000	1,253,000	(441,000)	0	0	0
Exercise of Warrants, Shares		250,000
Stock based compensation	1,082,000	0	1,082,000	0	0	0
Earnings (loss) from continuing operations	4,818,000	0	0	5,234,000	0	(416,000)
Earnings (loss) from discontinued operations	0	0	0	0	0	0
Currency translation adjustment	(4,437,000)	0	0	0	(4,138,000)	(299,000)
Change in fair value of interest rate swap, net of income taxes	(196,000)	0	0	0	(129,000)	(67,000)
Balance at Apr. 04, 2015	$ 357,023,000	$ 194,316,000	$ 22,352,000	$ 134,543,000	$ (6,045,000)	$ 11,857,000
Balance, shares at Apr. 04, 2015		67,727,000