Income Taxes Income Tax Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Statutory rate applied to income (loss) from continuing operations before taxes	$ 604	$ 1,743	$ (369)
Plus state income taxes, net of federal tax effect	(169)	96	24
Total statutory provision (benefit)	435	1,839	(345)
Nondeductible meals and entertainment	143	112	88
Domestic production activities deduction	112	(208)	0
Federal tax credits	(483)	(1,612)	0
Reserve for uncertain tax positions	109	286	0
Goodwill	(124)	283	0
Change in valuation allowance	569	(1,190)	0
Non-taxable insurance proceeds	0	(71)	0
Stock-based compensation	117	0	14
True-up to tax return	102	14	(75)
Other items	73	(30)	(83)
Income tax provision (benefit)	$ 1,053us-gaap_IncomeTaxExpenseBenefit	$ (577)us-gaap_IncomeTaxExpenseBenefit	$ (401)us-gaap_IncomeTaxExpenseBenefit

Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal and State Statutory Income Tax Rates

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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