Concentrations of Credit and Operation Risk (Details) (Narrative)	Dec. 29, 2012	Dec. 31, 2011
Concentration Risk [Line Items]
Number of concentrated customers accounted in consolidated accounts receivable	3	3
Top Customer One
Concentration Risk [Line Items]
Percentage of accounts receivable	22.00%	15.00%
Top Customer Two
Concentration Risk [Line Items]
Percentage of accounts receivable	16.00%	15.00%
Top Customer Three
Concentration Risk [Line Items]
Percentage of accounts receivable	14.00%	14.00%