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Segment Reporting: (Details)
 3 Months Ended 6 Months Ended
Jun. 25, 2022
USD ($)
Jun. 26, 2021
USD ($)
Jun. 25, 2022
USD ($)
item
Jun. 26, 2021
USD ($)
Dec. 25, 2021
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 19,070,800 $ 19,029,600 $ 39,120,600 $ 37,688,500  
Total operating income 12,355,100 11,976,900 25,793,300 24,633,900  
Total depreciation and amortization 116,900 109,400 219,400 223,200  
Total identifiable assets 27,054,300   27,054,300   $ 26,899,000
Operating | Franchising          
Segment Reporting          
Total revenue 17,858,800 16,181,000 35,036,900 31,602,900  
Total operating income 11,742,400 10,546,900 22,943,100 21,271,400  
Total depreciation and amortization 81,900 62,300 149,400 128,200  
Total identifiable assets 8,401,500   8,401,500   4,907,800
Operating | Leasing          
Segment Reporting          
Total revenue 1,212,000 2,848,600 4,083,700 6,085,600  
Total operating income 612,700 1,430,000 2,850,200 3,362,500  
Total depreciation and amortization 35,000 $ 47,100 70,000 $ 95,000  
Total identifiable assets 2,399,700   2,399,700   3,600,500
Unallocated          
Segment Reporting          
Total identifiable assets $ 16,253,100   $ 16,253,100   $ 18,390,700