SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - Allowance for doubtful receivables - USD ($)	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Movement in valuation and qualifying accounts
Balance Beginning of Period	$ 52,000	$ 52,000	$ 100,000
Additions Charged to Costs and Expenses	1,000	7,000	63,000
Deductions	1,000	7,000	111,000
Balance End of Period	$ 52,000	$ 52,000	$ 52,000