Quarterly Financial Data (Details): (USD $)	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Quarterly Financial Data (Unaudited):
Total Revenue	$ 16,182,800	$ 16,404,400	$ 14,038,900	$ 14,552,600	$ 13,767,400	$ 14,791,900	$ 14,023,500	$ 13,148,400	$ 61,178,700	$ 55,731,200	$ 51,943,100
Income from Operations	9,354,500	9,177,700	7,092,600	7,434,500	7,501,600	8,541,300	7,061,200	6,675,900	33,059,300	29,780,000	27,299,100
Net Income	$ 5,610,800	$ 5,623,000	$ 4,280,800	$ 4,551,900	$ 4,585,800	$ 5,251,500	$ 4,336,900	$ 4,057,500	$ 20,066,500	$ 18,231,600	$ 12,937,900
Net Income Per Common Share - Basic	$ 1.12	$ 1.12	$ 0.84	$ 0.88	$ 0.89	$ 1.03	$ 0.86	$ 0.81	$ 3.96	$ 3.60	$ 2.57
Net Income Per Common Share - Diluted	$ 1.09	$ 1.09	$ 0.82	$ 0.86	$ 0.87	$ 1.00	$ 0.83	$ 0.78	$ 3.85	$ 3.48	$ 2.47