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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 28, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 28, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
Dec. 30, 2023
USD ($)
Segment Reporting          
Number of reportable operating segments | segment     1    
Number of non-reportable operating segments | segment     1    
Total revenue $ 21,510,900 $ 22,317,800 $ 61,741,100 $ 63,203,600  
Total operating income 14,928,600 15,122,500 40,164,400 40,761,700  
Total identifiable assets 51,951,200   51,951,200   $ 28,967,700
Operating | Franchising          
Segment Reporting          
Total revenue 21,194,700 21,025,900 60,063,700 59,254,900  
Total operating income 14,763,000 13,971,400 38,828,200 37,562,800  
Operating | Other          
Segment Reporting          
Total revenue 316,200 1,291,900 1,677,400 3,948,700  
Total operating income $ 165,600 $ 1,151,100 $ 1,336,200 $ 3,198,900