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Investments: (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 28, 2014
Dec. 28, 2013
Summary of marketable securities classified as available-for-sale securities      
Equity securities, Cost $ 845,200 $ 845,200 $ 743,100
Equity securities, Fair Value 839,900 839,900 736,500
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss      
Unrealized gains 19,300 19,300 6,800
Unrealized losses (24,600) (24,600) (13,400)
Net unrealized losses (5,300) (5,300) (6,600)
Realized gains and losses recognized on sales of available-for-sale marketable securities      
Realized gains 4,600 26,800  
Realized losses (13,500) (26,300)  
Net realized gains/(losses) $ (8,900) $ 500