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Investments: (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 27, 2014
Dec. 28, 2013
Summary of marketable securities classified as available-for-sale securities      
Equity securities, Cost $ 782,400 $ 782,400 $ 743,100
Equity securities, Fair Value 715,800 715,800 736,500
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss      
Unrealized gains 800 800 6,800
Unrealized losses (67,400) (67,400) (13,400)
Net unrealized losses (66,600) (66,600) (6,600)
Realized gains and losses recognized on sales of available-for-sale marketable securities      
Realized gains 12,200 39,000  
Realized losses   (26,300)  
Net realized gains/(losses) $ 12,200 $ 12,700