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Investments (Details) (USD $)
12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Summary of marketable securities classified as available-for-sale securities      
Equity securities, Cost $ 743,100 $ 92,400  
Equity securities, Fair Value 736,500 85,900  
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss      
Unrealized gains 6,800   32,900
Unrealized losses (13,400) (6,500) (4,900)
Net unrealized gains/(losses) (6,600) (6,500) 28,000
Realized gains and losses recognized on sales of available-for-sale marketable securities      
Realized gains 25,200 52,500 58,600
Realized losses   (31,300) (600)
Net realized gains/(losses) $ 25,200 $ 21,200 $ 58,000