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Segment Reporting: (Details)
 3 Months Ended 6 Months Ended
Jun. 29, 2024
USD ($)
Jul. 01, 2023
USD ($)
Jun. 29, 2024
USD ($)
segment
Jul. 01, 2023
USD ($)
Dec. 30, 2023
USD ($)
Segment Reporting          
Number of reportable operating segments | segment     1    
Number of non-reportable operating segments | segment     1    
Total revenue $ 20,120,500 $ 20,362,200 $ 40,230,200 $ 40,885,800  
Total operating income 13,017,600 13,250,800 25,235,800 25,639,200  
Total identifiable assets 44,686,900   44,686,900   $ 28,967,700
Operating | Franchising          
Segment Reporting          
Total revenue 19,596,100 19,342,400 38,869,000 38,229,000  
Total operating income 12,589,300 12,383,900 24,065,200 23,591,400  
Operating | Other.          
Segment Reporting          
Total revenue 524,400 1,019,800 1,361,200 2,656,800  
Total operating income $ 428,300 $ 866,900 $ 1,170,600 $ 2,047,800