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Investments: (Details) (USD $)
3 Months Ended
Mar. 29, 2014
Dec. 28, 2013
Summary of marketable securities classified as available-for-sale securities    
Equity securities, Cost $ 814,000 $ 743,100
Equity securities, Fair Value 791,600 736,500
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss    
Unrealized gains 5,800 6,800
Unrealized losses (28,200) (13,400)
Net unrealized losses (22,400) (6,600)
Realized gains and losses recognized on sales of available-for-sale marketable securities    
Realized gains 22,200  
Realized losses (12,800)  
Net realized gains $ 9,400