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Quarterly Financial Data (Unaudited): (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 28, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 29, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Quarterly Financial Data (Unaudited):                      
Total Revenue $ 13,767,400 $ 14,791,900 $ 14,023,500 $ 13,148,400 $ 13,118,200 $ 14,799,100 $ 12,192,400 $ 11,833,400 $ 55,731,200 $ 51,943,100 $ 51,335,000
Income from Operations 7,501,600 8,541,300 7,061,200 6,675,900 6,962,900 8,463,500 6,026,500 5,846,200 29,780,000 27,299,100 24,847,600
Net income $ 4,585,800 $ 5,251,500 $ 4,336,900 $ 4,057,500 $ 1,758,000 $ 4,259,500 $ 3,404,400 $ 3,516,000 $ 18,231,600 $ 12,937,900 $ 14,095,000
Net Income Per Common Share - Basic (in dollars per share) $ 0.89 $ 1.03 $ 0.86 $ 0.81 $ 0.35 $ 0.85 $ 0.67 $ 0.70 $ 3.60 $ 2.57 $ 2.83
Net Income Per Common Share - Diluted (in dollars per share) $ 0.87 $ 1.00 $ 0.83 $ 0.78 $ 0.34 $ 0.82 $ 0.65 $ 0.67 $ 3.48 $ 2.47 $ 2.69