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Segment Reporting: (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 25, 2021
USD ($)
Dec. 26, 2020
USD ($)
Segment Reporting      
Number of reportable business segments | item 2    
Total revenue $ 81,410,800 $ 78,216,200 $ 66,061,800
Total operating income 53,612,800 51,336,200 40,211,500
Total depreciation and amortization 603,100 430,600 484,700
Total identifiable assets 30,455,700 26,899,000  
Franchising | Canadian operations      
Segment Reporting      
Total revenue 6,400,000 4,900,000 4,000,000.0
Operating | Franchising      
Segment Reporting      
Total revenue 74,473,100 67,067,900 51,577,800
Total operating income 49,007,900 44,832,100 31,880,200
Total depreciation and amortization 463,100 243,900 285,300
Total identifiable assets 8,901,000 4,907,800  
Operating | Leasing      
Segment Reporting      
Total revenue 6,937,700 11,148,300 14,484,000
Total operating income 4,604,900 6,504,100 8,331,300
Total depreciation and amortization 140,000 186,700 $ 199,400
Total identifiable assets 784,300 3,600,500  
Unallocated      
Segment Reporting      
Total identifiable assets $ 20,770,400 $ 18,390,700