Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Reconciliation between the amount determined by applying the statutory federal income tax rate to the income tax provision      
Expected expense at statutory rate $ 5,552 $ 3,393 $ 3,971
Change resulting from:      
State tax provision, net 434 249 365
Federal and state credits (167) (92) (152)
Domestic Production benefits (322) (253) (334)
Nondeductible expenses and other 271 63 382
Income tax expense $ 5,768 $ 3,360 $ 4,232
Effective income tax rate reconciliation      
Effective tax rate (as a percent) 35.30% 33.70% 36.20%