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Income Taxes - Summary of Federal Statutory Rate and Provision for Income (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Income Tax Disclosure [Abstract]        
Income tax expense at federal rate     $ 533,867  
State tax expense, net of Federal effect     66,356  
Permanent Differences:        
Meals and entertainment     19,004  
Officer's life insurance     891  
Domestic production activities deduction     (51,368)  
Total tax credits     (56,935)  
Total permanent differences     (88,408)  
Prior period adjustment     (8,536)  
Total income tax expense $ 223,791 $ 205,973 $ 503,279 $ 197,541
Income tax expense at federal rate, percentage     34.00%  
State tax expense, net of Federal effect, percentage     4.23%  
Permanent Differences:        
Meals and entertainment, percentage     1.21%  
Officer's life insurance, percentage     0.06%  
Domestic production activities deduction, percentage     (3.27%)  
Total tax credits, percentage     (3.63%)  
Total permanent differences, percentage     (5.63%)  
Prior period adjustment, percentage     (0.55%)  
Total income tax expense     32.05%