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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 26, 2015
USD ($)
Sep. 27, 2014
USD ($)
Sep. 26, 2015
USD ($)
item
Sep. 27, 2014
USD ($)
Dec. 27, 2014
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 15,999,500 $ 16,404,400 $ 52,500,300 $ 44,995,900  
Total operating income 9,341,800 9,177,700 27,400,100 23,704,800  
Total depreciation 108,600 102,200 322,800 304,600  
Total identifiable assets 46,774,600   46,774,600   $ 54,727,800
Operating | Franchising          
Segment Reporting          
Total revenue 12,752,500 12,282,600 35,580,400 33,340,900  
Total operating income 7,827,500 7,132,700 19,679,000 17,145,100  
Total depreciation 85,900 80,700 255,800 240,400  
Total identifiable assets 3,336,100   3,336,100   3,258,300
Operating | Leasing          
Segment Reporting          
Total revenue 3,247,000 4,121,800 16,919,900 11,655,000  
Total operating income 1,514,300 2,045,000 7,721,100 6,559,700  
Total depreciation 22,700 $ 21,500 67,000 $ 64,200  
Total identifiable assets 40,739,800   40,739,800   44,870,800
Unallocated          
Segment Reporting          
Total identifiable assets $ 2,698,700   $ 2,698,700   $ 6,598,700