Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance, value at Dec. 29, 2012	$ 21,905	$ 5	$ 94	$ 38,958	$ (17,152)
Beginning Balance, shares at Dec. 29, 2012		500,000	8,452,971
Issuance of common stock under stock option plan	$ 1,495		$ 5	1,490
Issuance of common stock under stock option plan, shares	493,622		493,622
Employee stock-based compensation expense	$ 689			689
Release of restricted stock, shares			27,915
Stock repurchase	(426)			(426)
Stock repurchase, shares			(75,025)
Stock repurchased from tender offer	(40)			(40)
Preferred stock conversion to common stock		$ (5)	$ 5
Preferred stock conversion to common stock, share		(500,000)	1,000,000
Net income	2,231				2,231
Ending Balance, value at Dec. 28, 2013	25,854		$ 104	40,671	(14,921)
Ending Balance, shares at Dec. 28, 2013			9,899,483
Issuance of common stock under stock option plan	$ 1,501		$ 4	1,497
Issuance of common stock under stock option plan, shares	399,390		399,390
Employee stock-based compensation expense	$ 972			972
Excess tax benefits from stock-based awards	36			36
Release of restricted stock, shares			50,262
Stock repurchase	(4,665)			(4,665)
Stock repurchase, shares			(562,440)
Net income	10,038				10,038
Ending Balance, value at Jan. 03, 2015	33,736		$ 108	38,511	(4,883)
Ending Balance, shares at Jan. 03, 2015			9,786,695
Issuance of common stock under stock option plan	$ 1,027		$ 3	1,024
Issuance of common stock under stock option plan, shares	277,733		277,733
Employee stock-based compensation expense	$ 895			895
Release of restricted stock, value	(606)			(606)
Release of restricted stock, shares			144,756
Repurchase of employee share awards	(275)			(275)
Stock repurchase	$ (1,563)			(1,563)
Stock repurchase, shares	(199,776)		(199,776)
Net income	$ 474				474
Ending Balance, value at Jan. 02, 2016	$ 33,688		$ 111	$ 37,986	$ (4,409)
Ending Balance, shares at Jan. 02, 2016			10,009,408