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Segment Reporting: (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 25, 2011
Jun. 30, 2012
segment
Jun. 25, 2011
Dec. 31, 2011
Segment Reporting:          
Number of reportable business segments     2    
Segment Reporting          
Total revenue $ 12,192,400 $ 15,224,800 $ 24,025,800 $ 26,329,700  
Total operating income 6,026,500 6,084,100 11,872,700 11,296,100  
Total depreciation 104,900 122,200 219,400 242,700  
Total identifiable assets 42,465,300   42,465,300   47,745,700
Franchising
          
Segment Reporting          
Total revenue 8,907,400 8,224,600 18,348,700 16,074,500  
Total operating income 4,271,300 3,712,300 9,099,800 7,453,100  
Total depreciation 81,300 27,400 170,200 54,200  
Total identifiable assets 2,207,700   2,207,700   7,753,200
Leasing
          
Segment Reporting          
Total revenue 3,285,000 7,000,200 5,677,100 10,255,200  
Total operating income 1,755,200 2,371,800 2,772,900 3,843,000  
Total depreciation 23,600 94,800 49,200 188,500  
Total identifiable assets 34,038,000   34,038,000   33,374,000
Unallocated
          
Segment Reporting          
Total identifiable assets $ 6,219,600   $ 6,219,600   $ 6,618,500