Liabilities (Details) (USD $)	0 Months Ended	12 Months Ended
Jun. 01, 2009	Dec. 12, 2007	Dec. 28, 2012	Dec. 30, 2011	Mar. 01, 2007
Common stock price per share	$ 1.01	$ 2.63	$ 5.82	$ 10.49
Number of warrants	700,000	700,000	70,000	70,000	70,000
Expected dividends	0.00%	0.00%	0.00%	0.00%
Expected volatility	7.44%	6.73%	42.15%	63.61%
Risk-free rate	3.28%	3.88%	0.01%	0.25%
Life (in years)	6 years	6 years	0 years 2 months 23 days	1 year 3 months

Aggregate amount of each class of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph i

-Article 4

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Price of a single share of a number of saleable stocks of a company.

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