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Segment Reporting: (Details)
 3 Months Ended 6 Months Ended
Jun. 29, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 29, 2019
USD ($)
item
Jun. 30, 2018
USD ($)
Dec. 29, 2018
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 17,404,200 $ 18,159,800 $ 35,735,400 $ 36,320,800  
Total operating income 9,846,900 10,074,700 19,913,400 20,148,900  
Total depreciation and amortization 85,900 79,300 166,000 155,100  
Total identifiable assets 46,156,100   46,156,100   $ 46,663,100
Operating | Franchising          
Segment Reporting          
Total revenue 14,201,200 13,302,700 27,377,100 25,934,900  
Total operating income 8,450,800 7,407,500 15,948,800 14,200,000  
Total depreciation and amortization 67,400 60,700 129,900 117,900  
Total identifiable assets 4,183,300   4,183,300   5,208,400
Operating | Leasing          
Segment Reporting          
Total revenue 3,203,000 4,857,100 8,358,300 10,385,900  
Total operating income 1,396,100 2,667,200 3,964,600 5,948,900  
Total depreciation and amortization 18,500 $ 18,600 36,100 $ 37,200  
Total identifiable assets 34,248,100   34,248,100   40,490,000
Unallocated          
Segment Reporting          
Total identifiable assets $ 7,724,700   $ 7,724,700   $ 964,700