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Segment Reporting: (Details)
 3 Months Ended
Mar. 30, 2024
USD ($)
item
Apr. 01, 2023
USD ($)
Dec. 30, 2023
USD ($)
Segment Reporting      
Number of reportable operating segments | item 1    
Total revenue $ 20,109,500 $ 20,523,600  
Total operating income 12,218,200 12,388,400  
Total identifiable assets 38,336,000   $ 28,967,700
Operating | Franchising      
Segment Reporting      
Total revenue 19,272,700 18,886,600  
Total operating income 11,475,900 11,207,500  
Operating | Other.      
Segment Reporting      
Total revenue 836,800 1,637,000  
Total operating income $ 742,300 $ 1,180,900