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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 24, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 24, 2022
USD ($)
Segment Reporting        
Number of reportable operating segments | segment     1  
Number of non-reportable operating segments | segment     1  
Total revenue $ 22,317,800 $ 21,164,500 $ 63,203,600 $ 60,285,100
Total operating income 15,122,500 14,421,100 40,761,700 40,214,400
Operating | Franchising        
Segment Reporting        
Total revenue 21,025,900 19,402,400 59,254,900 54,439,300
Total operating income 13,971,400 13,346,800 37,562,800 36,289,900
Operating | Other.        
Segment Reporting        
Total revenue 1,291,900 1,762,100 3,948,700 5,845,800
Total operating income $ 1,151,100 $ 1,074,300 $ 3,198,900 $ 3,924,500