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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 24, 2022
USD ($)
Sep. 25, 2021
USD ($)
Sep. 24, 2022
USD ($)
item
Sep. 25, 2021
USD ($)
Dec. 25, 2021
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 21,164,500 $ 20,153,400 $ 60,285,100 $ 57,841,900  
Total operating income 14,421,100 13,789,200 40,214,400 38,423,100  
Total depreciation and amortization 190,100 105,600 409,500 328,800  
Total identifiable assets 33,730,400   33,730,400   $ 26,899,000
Operating | Franchising          
Segment Reporting          
Total revenue 19,402,400 17,887,200 54,439,300 49,490,100  
Total operating income 13,346,800 12,330,200 36,289,900 33,601,600  
Total depreciation and amortization 155,200 59,400 304,600 187,600  
Total identifiable assets 7,917,400   7,917,400   4,907,800
Operating | Leasing          
Segment Reporting          
Total revenue 1,762,100 2,266,200 5,845,800 8,351,800  
Total operating income 1,074,300 1,459,000 3,924,500 4,821,500  
Total depreciation and amortization 34,900 $ 46,200 104,900 $ 141,200  
Total identifiable assets 1,253,500   1,253,500   3,600,500
Unallocated          
Segment Reporting          
Total identifiable assets $ 24,559,500   $ 24,559,500   $ 18,390,700