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Investments: (Details) - USD ($)
3 Months Ended
Mar. 26, 2016
Apr. 01, 2017
Dec. 31, 2016
Summary of marketable securities classified as available-for-sale securities      
Equity securities, Cost   $ 215,800 $ 215,800
Equity securities, Fair Value   207,500 199,900
Unrealized gains and losses for marketable securities classified as available-for-sale securities in accumulated other comprehensive loss      
Unrealized gains   1,000  
Unrealized losses   (9,300) (15,900)
Net unrealized losses   $ (8,300) $ (15,900)
Realized gains and losses recognized on sales of available-for-sale marketable securities      
Realized losses $ (6,200)    
Net realized losses $ (6,200)