Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 4)

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Income Taxes (Details 4) - USD ($)
12 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Dec. 29, 2013
Income Tax Disclosure [Abstract]      
Valuation allowance $ 1,910,000 $ 990,000  
Federal alternative minimum tax credit 1,262,000 1,262,000  
General business and other tax credits 3,300,000    
Unrecognized tax benefits that would impact effective tax rate if recognized 200,000    
Income tax penalties recorded $ 0 $ 0 $ 0