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Segment Reporting: (Details)
 12 Months Ended
Dec. 28, 2024
USD ($)
segment
item
Dec. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting      
Number of reportable operating segments | item 1    
Number of non-reportable operating segments | segment 1    
Revenue:      
Other $ 1,811,800 $ 4,766,200 $ 6,937,700
Revenues 81,289,100 83,243,500 81,410,800
Expenses:      
Merchandise COGS 3,379,200 4,461,500 3,712,800
Selling, general and administrative expenses 24,944,200 25,108,700 23,158,400
Reconciliation to operating income:      
Total income from operations 52,930,600 53,280,600 53,612,800
Depreciation and amortization:      
Total depreciation and amortization 799,300 772,700 603,100
Identifiable assets:      
Total identifiable assets 26,844,500 28,967,700  
Merchandise      
Revenue:      
Revenue 3,601,300 4,761,100 3,921,600
Franchising | Canadian operations      
Revenue:      
Revenues 7,300,000 6,800,000 6,400,000
Operating | Franchising      
Revenue:      
Revenue 79,477,300 78,477,300 74,473,100
Expenses:      
Merchandise COGS 3,379,200 4,461,500 3,712,800
Selling, general and administrative expenses 24,504,800 24,639,900 21,752,400
Total segment expenses 27,884,000 29,101,400 25,465,200
Reconciliation to operating income:      
Total income from operations 51,593,300 49,375,900 49,007,900
Depreciation and amortization:      
Total depreciation and amortization 715,500 646,900 463,100
Identifiable assets:      
Total identifiable assets 7,289,500 7,570,000  
Operating | Other      
Revenue:      
Other 1,811,800 4,766,200 6,937,700
Reconciliation to operating income:      
Total income from operations 1,337,300 3,904,700 4,604,900
Depreciation and amortization:      
Total depreciation and amortization 83,800 125,800 $ 140,000
Identifiable assets:      
Total identifiable assets 19,400 281,200  
Unallocated      
Identifiable assets:      
Total identifiable assets $ 19,535,600 $ 21,116,500