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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Sep. 28, 2019
USD ($)
item
Sep. 29, 2018
USD ($)
Dec. 29, 2018
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 19,680,900 $ 19,118,500 $ 55,416,300 $ 55,439,300  
Total operating income 12,274,700 11,435,300 32,188,100 31,584,200  
Total depreciation and amortization 110,700 78,600 276,700 233,700  
Total identifiable assets 48,507,500   48,507,500   $ 46,663,100
Operating | Franchising          
Segment Reporting          
Total revenue 15,305,400 14,509,900 42,682,500 40,444,800  
Total operating income 9,895,700 9,064,900 25,844,500 23,264,900  
Total depreciation and amortization 79,000 60,300 208,900 178,200  
Total identifiable assets 3,841,400   3,841,400   5,208,400
Operating | Leasing          
Segment Reporting          
Total revenue 4,375,500 4,608,600 12,733,800 14,994,500  
Total operating income 2,379,000 2,370,400 6,343,600 8,319,300  
Total depreciation and amortization 31,700 $ 18,300 67,800 $ 55,500  
Total identifiable assets 31,771,400   31,771,400   40,490,000
Unallocated          
Segment Reporting          
Total identifiable assets $ 12,894,700   $ 12,894,700   $ 964,700