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Segment Reporting: (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
item
Sep. 29, 2012
Dec. 29, 2012
Segment Reporting:          
Number of reportable business segments     2    
Segment Reporting          
Total revenue $ 14,791,900 $ 14,799,100 $ 41,963,800 $ 38,824,900  
Total operating income 8,541,300 8,463,500 22,278,400 20,336,200  
Total depreciation 109,400 107,200 321,400 326,600  
Total identifiable assets 49,245,200   49,245,200   43,538,800
Franchising
          
Segment Reporting          
Total revenue 10,981,800 10,486,400 30,615,700 28,835,100  
Total operating income 6,306,800 6,235,900 15,981,700 15,335,700  
Total depreciation 86,100 83,400 252,900 253,600  
Total identifiable assets 6,594,700   6,594,700   2,957,200
Leasing
          
Segment Reporting          
Total revenue 3,810,100 4,312,700 11,348,100 9,989,800  
Total operating income 2,234,500 2,227,600 6,296,700 5,000,500  
Total depreciation 23,300 23,800 68,500 73,000  
Total identifiable assets 40,645,100   40,645,100   37,622,800
Unallocated
          
Segment Reporting          
Total identifiable assets $ 2,005,400   $ 2,005,400   $ 2,958,800