Income Taxes Components of Income Tax Expense (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Tax Disclosure [Abstract]
Federal	$ 979us-gaap_CurrentFederalTaxExpenseBenefit	$ 282us-gaap_CurrentFederalTaxExpenseBenefit	$ 154us-gaap_CurrentFederalTaxExpenseBenefit
State	(190)	178	88
Total current	789us-gaap_CurrentIncomeTaxExpenseBenefit	460us-gaap_CurrentIncomeTaxExpenseBenefit	242us-gaap_CurrentIncomeTaxExpenseBenefit
Federal	243	(955)	(592)
State	21	(82)	(51)
Total deferred	264us-gaap_DeferredIncomeTaxExpenseBenefit	(1,037)us-gaap_DeferredIncomeTaxExpenseBenefit	(643)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision (benefit)	$ 1,053us-gaap_IncomeTaxExpenseBenefit	$ (577)us-gaap_IncomeTaxExpenseBenefit	$ (401)us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.