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Leases (Details) (USD $)
 12 Months Ended
Dec. 25, 2012
Dec. 27, 2011
Schedule of future minimum lease payments required for capital leases    
2013 $ 117,000  
2014 20,000  
Total 137,000  
Less amount representing interest of 10.9% 8,000  
Present value of minimum capital lease payments 129,000  
Less current maturities of obligations under capital leases 109,000  
Obligations under capital leases, excluding current maturities 20,000  
Percentage of interest under capital lease 10.90%  
Schedule of future minimum lease payments required for operating leases that have initial or remaining noncancelable terms in excess of one year    
2013 25,866,000  
2014 25,356,000  
2015 23,055,000  
2016 21,528,000  
2017 20,410,000  
Thereafter 97,262,000  
Total 213,477,000  
Leases    
Capitalized lease assets, cost 700,000 800,000
Accumulated amortization of property held under capital leases $ 400,000 $ 400,000