Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance, value at Jan. 01, 2011	$ 19,427	$ 5	$ 89	$ 41,168	$ (430)	$ (205)	$ (21,200)
Beginning Balance, shares at Jan. 01, 2011		500,000	8,986,418
Issuance of common stock under stock option plan	321		1	320
Issuance of common stock under stock option plan, shares	99,291		99,291
Employee stock-based compensation expense	544			544
Tax effect of stock compensation expense	2			2
Foreign currency translation adjustments	170					170
Issuance of common stock in connection with RetinaLabs acquisition			2	(2)
Stock repurchase	(648)				(648)
Stock repurchase, shares			(167,885)
Net income	2,610						2,610
Ending Balance, value at Dec. 31, 2011	22,426	5	92	42,032	(1,078)	(35)	(18,590)
Ending Balance, shares at Dec. 31, 2011		500,000	8,917,824
Issuance of common stock under stock option plan	445		2	443
Issuance of common stock under stock option plan, shares	174,631		174,631
Employee stock-based compensation expense	396			396
Release of restricted stock and escrow shares			36,815
Foreign currency translation adjustments	35					35
Stock repurchase	(734)				(734)
Stock repurchase, shares			(188,799)
Stock repurchased from tender offer, value	(2,101)			(2,101)
Stock repurchased from tender offer, share			(487,500)
Retirement of treasury stock				(1,812)	1,812
Net income	1,438						1,438
Ending Balance, value at Dec. 29, 2012	21,905	5	94	38,958			(17,152)
Ending 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 and escrow shares			27,915
Stock repurchase	(426)			(426)
Stock repurchase, shares			(75,025)
Stock repurchased from tender offer, value	(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