Quarterly Financial Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Quarterly Financial Data (Unaudited):
Total Revenue	$ 16,947,500	$ 15,999,500	$ 15,476,700	$ 21,024,100	$ 16,182,800	$ 16,404,400	$ 14,038,900	$ 14,552,600	$ 69,447,800	$ 61,178,700	$ 55,731,200
Income from Operations	9,690,600	9,341,800	8,084,200	9,974,100	9,354,500	9,177,700	7,092,600	7,434,500	37,090,700	33,059,300	29,780,000
Net Income	$ 5,654,400	$ 5,339,600	$ 4,751,400	$ 6,054,300	$ 5,610,800	$ 5,623,000	$ 4,280,800	$ 4,551,900	$ 21,799,700	$ 20,066,500	$ 18,231,600
Net Income Per Common Share - Basic	$ 1.37	$ 1.29	$ 1.04	$ 1.21	$ 1.12	$ 1.12	$ 0.84	$ 0.88	$ 4.89	$ 3.96	$ 3.60
Net Income Per Common Share - Diluted	$ 1.31	$ 1.23	$ 1.00	$ 1.17	$ 1.09	$ 1.09	$ 0.82	$ 0.86	$ 4.69	$ 3.85	$ 3.48