Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, shares at Dec. 28, 2013		24,296,497
Balance at Dec. 28, 2013	$ 288,584,000	$ 25,000	$ (4,405,000)	$ 202,622,000	$ 90,907,000	$ (565,000)
Stockholders' Equity
Net Income	1,948,000				1,948,000
Foreign currency translation adjustment, net of tax	1,000					1,000
Common stock issued under equity compensation plan, shares		391,950
Common stock issued under equity compensation plan, value	4,760,000			4,760,000
Tax benefit (deficiency) from equity issuance, including excess tax benefit	(173,000)			(173,000)
Treasury Stock, Shares, Acquired		(359,905)
Treasury Stock, Value, Acquired, Cost Method	$ (4,766,000)		4,766,000
Sale of common stock pursuant to associates stock buying plan, shares	75,119	75,119
Sale of common stock pursuant to associates stock buying plan, value	$ 654,000			654,000
Balance, shares at Jan. 03, 2015		24,403,661
Balance at Jan. 03, 2015	291,008,000	$ 25,000	(9,171,000)	207,863,000	92,855,000	(564,000)
Stockholders' Equity
Common Stock, Value, Issued		$ 0
Net Income	4,520,000				4,520,000
Foreign currency translation adjustment, net of tax	245,000					245,000
Common stock issued under equity compensation plan, shares		259,155
Common stock issued under equity compensation plan, value	3,928,000			3,928,000
Tax benefit (deficiency) from equity issuance, including excess tax benefit	(718,000)			(718,000)
Treasury Stock, Shares, Acquired		0
Treasury Stock, Value, Acquired, Cost Method	$ (114,000)		114,000
Sale of common stock pursuant to associates stock buying plan, shares	69,980	69,980
Sale of common stock pursuant to associates stock buying plan, value	$ 590,000			590,000
Balance, shares at Jan. 02, 2016	24,732,796	24,732,796
Balance at Jan. 02, 2016	$ 299,459,000	$ 25,000	(9,285,000)	211,663,000	97,375,000	(319,000)
Stockholders' Equity
Common Stock, Value, Issued	25,000	$ 0
Net Income	6,535,000				6,535,000
Foreign currency translation adjustment, net of tax	(215,000)					(215,000)
Common stock issued under equity compensation plan, shares		187,688
Common stock issued under equity compensation plan, value	2,781,000			2,780,000
Tax benefit (deficiency) from equity issuance, including excess tax benefit	(262,000)			(262,000)
Treasury Stock, Shares, Acquired		0
Treasury Stock, Value, Acquired, Cost Method	$ (176,000)		176,000
Sale of common stock pursuant to associates stock buying plan, shares	81,111	81,111
Sale of common stock pursuant to associates stock buying plan, value	$ 609,000			609,000
Balance, shares at Dec. 31, 2016	25,001,595	25,001,595
Balance at Dec. 31, 2016	$ 308,731,000	$ 26,000	$ (9,461,000)	$ 214,790,000	$ 103,910,000	$ (534,000)
Stockholders' Equity
Common Stock, Value, Issued	$ 26,000	$ 1,000