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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 27, 2025
USD ($)
Sep. 28, 2024
USD ($)
Sep. 27, 2025
USD ($)
segment
Sep. 28, 2024
USD ($)
Segment Reporting        
Number of reportable operating segments | segment     1  
Number of non-reportable operating segments | segment     1  
Revenue:        
Other $ 46,600 $ 316,200 $ 2,401,100 $ 1,677,400
Revenues 22,632,900 21,510,900 64,969,400 61,741,100
Expenses:        
Selling, general and administrative expenses 7,046,400 5,919,800 21,070,500 18,979,000
Reconciliation to operating income:        
Total income from operations 14,923,200 14,928,600 41,580,800 40,164,400
Operating        
Revenue:        
Revenues 22,632,900 21,510,900 64,969,400 61,741,100
Reconciliation to operating income:        
Total income from operations 14,923,200 14,928,600 41,580,800 40,164,400
Depreciation and amortization:        
Total depreciation and amortization 187,700 209,900 561,000 611,100
Operating | Franchising        
Revenue:        
Revenues 22,586,300 21,194,700 62,568,300 60,063,700
Expenses:        
Merchandise COGS 663,300 662,500 2,318,100 2,562,600
Selling, general and administrative expenses 7,042,700 5,769,200 20,979,000 18,672,900
Total segment expenses 7,706,000 6,431,700 23,297,100 21,235,500
Reconciliation to operating income:        
Total income from operations 14,880,300 14,763,000 39,271,200 38,828,200
Depreciation and amortization:        
Total depreciation and amortization 187,700 188,900 561,000 527,300
Operating | Other        
Revenue:        
Revenues 46,600 316,200 2,401,100 1,677,400
Reconciliation to operating income:        
Total income from operations $ 42,900 165,600 $ 2,309,600 1,336,200
Depreciation and amortization:        
Total depreciation and amortization   $ 21,000   $ 83,800