Condensed Consolidated Statements of Shareholders' Equity - Unaudited - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance (in shares) at Dec. 29, 2013	34,990,000			72,000
Balance at Dec. 29, 2013	$ 350	$ 169,107	$ (68,804)		$ 100,653
Net income			15,768		15,768
Cash dividends			$ (3,596)		$ (3,596)
Repurchase of common stock (in shares)	(541,000)				(541,190)
Repurchase of common stock	$ (5)	$ (6,735)			$ (6,740)
Shares issued under stock compensation plan net of shares withheld for tax effects (in shares)	406,000
Shares issued under stock compensation plan net of shares withheld for tax effects	$ 4	(2,022)			(2,018)
Excess tax benefit from stock based compensation		1,398			1,398
Stock-based compensation		1,323			1,323
Balance at June 28, 2015 (in shares) at Jun. 29, 2014	34,855,000			72,000
Balance at June 28, 2015 at Jun. 29, 2014	$ 349	163,071	$ (56,632)		106,788
Balance (in shares) at Dec. 28, 2014	34,334,000			72,000
Balance at Dec. 28, 2014	$ 343	$ 155,455	(59,487)		96,311
Net income			17,928		17,928
Cash dividends			$ (4,173)		$ (4,173)
Repurchase of common stock (in shares)	(351,000)				(350,749)
Repurchase of common stock	$ (4)	$ (5,255)			$ (5,259)
Shares issued under stock compensation plan net of shares withheld for tax effects (in shares)	228,000
Shares issued under stock compensation plan net of shares withheld for tax effects	$ 3	(888)			(885)
Excess tax benefit from stock based compensation		540			540
Stock-based compensation		1,565			1,565
Balance at June 28, 2015 (in shares) at Jun. 28, 2015	34,211,000			72,000
Balance at June 28, 2015 at Jun. 28, 2015	$ 342	$ 151,417	$ (45,732)		$ 106,027