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Quarterly Financial Data (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Sep. 24, 2016
Jun. 25, 2016
Mar. 26, 2016
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Quarterly Financial Data (Unaudited):                      
Total Revenue $ 17,804,700 $ 17,567,900 $ 16,749,500 $ 17,623,800 $ 17,365,900 $ 16,734,300 $ 16,299,800 $ 16,180,300 $ 69,745,900 $ 66,580,300 $ 69,447,800
Income from Operations 10,663,000 9,852,000 9,134,200 9,135,400 10,501,300 10,438,000 9,323,100 8,038,600 38,784,600 38,301,000 37,090,700
Net Income $ 7,656,500 $ 5,719,000 $ 5,773,200 $ 5,416,400 $ 6,166,200 $ 6,094,200 $ 5,394,300 $ 4,562,900 $ 24,565,100 $ 22,217,600 $ 21,799,700
Net Income Per Common Share - Basic $ 2.00 $ 1.42 $ 1.37 $ 1.30 $ 1.49 $ 1.48 $ 1.31 $ 1.11 $ 6.06 $ 5.39 $ 4.89
Net Income Per Common Share - Diluted $ 1.86 $ 1.33 $ 1.29 $ 1.22 $ 1.41 $ 1.41 $ 1.25 $ 1.06 $ 5.66 $ 5.13 $ 4.69