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Significant Accounting Policies: (Details) (USD $)
 12 Months Ended
Dec. 28, 2013
item
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Receivables        
Allowance for doubtful accounts $ 4,300 $ 17,300 $ 15,100 $ 17,400
Leasing Income Recognition        
Threshold delinquent period of lease rentals to classify lease as non-accrual 90 days      
Minimum monthly payments owed to classify lease as non-accrual 3      
Allowance for Credit Losses        
Delinquent period for charging-off against allowance for credit losses 121 days      
Canada
        
Cash equivalents        
Cash located in banks $ 55,700 $ 107,400