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Segment Reporting: (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
item
Sep. 28, 2013
Dec. 28, 2013
Segment Reporting:          
Number of reportable business segments     2    
Segment Reporting          
Total revenue $ 16,404,400 $ 14,791,900 $ 44,995,900 $ 41,963,800  
Total operating income 9,177,700 8,541,300 23,704,800 22,278,400  
Total depreciation 102,200 109,400 304,600 321,400  
Total identifiable assets 49,941,300   49,941,300   53,036,100
Operating | Franchising
          
Segment Reporting          
Total revenue 12,282,600 10,981,800 33,340,900 30,615,700  
Total operating income 7,132,700 6,306,800 17,145,100 15,981,700  
Total depreciation 80,700 86,100 240,400 252,900  
Total identifiable assets 3,291,500   3,291,500   7,407,400
Operating | Leasing
          
Segment Reporting          
Total revenue 4,121,800 3,810,100 11,655,000 11,348,100  
Total operating income 2,045,000 2,234,500 6,559,700 6,296,700  
Total depreciation 21,500 23,300 64,200 68,500  
Total identifiable assets 44,197,000   44,197,000   42,490,800
Unallocated
          
Segment Reporting          
Total identifiable assets $ 2,452,800   $ 2,452,800   $ 3,137,900