Investments (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Summary of marketable securities classified as available-for-sale securities
Equity securities, Cost	$ 92,400	$ 1,015,800
Equity securities, Fair Value	85,900	1,043,800
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive income
Unrealized gains		32,900
Unrealized losses	(6,500)	(4,900)
Net unrealized gains/ (losses)	(6,500)	28,000
Realized gains and losses recognized on sales of available-for-sale marketable securities
Realized gains	52,500	58,600
Realized losses	(31,300)	(600)
Net realized gains / (losses)	$ 21,200	$ 58,000