SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for doubtful receivables, USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Allowance for doubtful receivables
Movement in valuation and qualifying accounts
Balance Beginning of Period	$ 200,000	$ 100,000	$ 70,000
Additions (Reduction) Charged to Costs and Expenses	(100,000)	152,000	52,000
Deductions		52,000	22,000
Balance End of Period	$ 100,000	$ 200,000	$ 100,000