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Investments: (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 29, 2013
Dec. 29, 2012
Summary of marketable securities classified as available-for-sale securities      
Equity securities, Cost   $ 92,400 $ 92,400
Equity securities, Fair Value   84,500 85,900
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive income      
Unrealized losses   (7,900) (6,500)
Net unrealized losses   (7,900) (6,500)
Realized gains and losses recognized on sales of available-for-sale marketable securities      
Realized gains 42,300    
Realized losses (12,300)    
Net realized gains/(losses) $ 30,000