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Segment Reporting: (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 29, 2012
Sep. 24, 2011
Sep. 29, 2012
segment
Sep. 24, 2011
Dec. 31, 2011
Segment Reporting:          
Number of reportable business segments     2    
Segment Reporting          
Total revenue $ 14,799,100 $ 11,773,500 $ 38,824,900 $ 38,103,200  
Total operating income 8,463,500 6,645,700 20,336,200 17,941,800  
Total depreciation 107,200 118,900 326,600 361,600  
Total identifiable assets 43,142,000   43,142,000   47,745,700
Franchising
          
Segment Reporting          
Total revenue 10,486,400 9,400,700 28,835,100 25,475,200  
Total operating income 6,235,900 5,637,400 15,335,700 13,090,500  
Total depreciation 83,400 92,200 253,600 280,700  
Total identifiable assets 3,131,600   3,131,600   7,753,200
Leasing
          
Segment Reporting          
Total revenue 4,312,700 2,372,800 9,989,800 12,628,000  
Total operating income 2,227,600 1,008,300 5,000,500 4,851,300  
Total depreciation 23,800 26,700 73,000 80,900  
Total identifiable assets 35,480,300   35,480,300   33,374,000
Unallocated
          
Segment Reporting          
Total identifiable assets $ 4,530,100   $ 4,530,100   $ 6,618,500