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Segment Reporting: (Details)
 3 Months Ended
Mar. 26, 2022
USD ($)
item
Mar. 27, 2021
USD ($)
Dec. 25, 2021
USD ($)
Segment Reporting      
Number of reportable business segments | item 2    
Total revenue $ 20,049,800 $ 18,658,900  
Total operating income 13,438,200 12,657,000  
Total depreciation and amortization 102,500 113,800  
Total identifiable assets 15,270,900   $ 26,899,000
Operating | Franchising      
Segment Reporting      
Total revenue 17,178,100 15,421,900  
Total operating income 11,200,700 10,724,500  
Total depreciation and amortization 67,500 65,900  
Total identifiable assets 4,181,900   4,907,800
Operating | Leasing      
Segment Reporting      
Total revenue 2,871,700 3,237,000  
Total operating income 2,237,500 1,932,500  
Total depreciation and amortization 35,000 $ 47,900  
Total identifiable assets 3,198,500   3,600,500
Unallocated      
Segment Reporting      
Total identifiable assets $ 7,890,500   $ 18,390,700