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. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Income Tax Disclosure [Abstract]      
Valuation allowance $ 3,742,000 $ 2,323,000  
AMT Credit carryforwards that are expected to be fully refunded 1,200,000    
Federal alternative minimum tax credit 0 1,241,000  
Unrecognized tax benefits that would impact effective tax rate if recognized 300,000    
Income tax penalties recorded $ 0 $ 0 $ 0