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Segment Reporting: (Details)
 3 Months Ended 9 Months Ended
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Dec. 30, 2017
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 19,118,500 $ 17,730,900 $ 55,439,300 $ 51,971,500  
Total operating income 11,435,300 10,039,500 31,584,200 28,166,000  
Total depreciation and amortization 78,600 87,000 233,700 275,700  
Total identifiable assets 50,494,500   50,494,500   $ 48,842,000
Operating | Franchising          
Segment Reporting          
Total revenue 14,509,900 13,815,100 40,444,800 38,249,500  
Total operating income 9,064,900 8,332,900 23,264,900 21,544,600  
Total depreciation and amortization 60,300 66,300 178,200 211,200  
Total identifiable assets 4,061,400   4,061,400   4,051,400
Operating | Leasing          
Segment Reporting          
Total revenue 4,608,600 3,915,800 14,994,500 13,722,000  
Total operating income 2,370,400 1,706,600 8,319,300 6,621,400  
Total depreciation and amortization 18,300 $ 20,700 55,500 $ 64,500  
Total identifiable assets 45,981,600   45,981,600   42,153,600
Unallocated          
Segment Reporting          
Total identifiable assets $ 451,500   $ 451,500   $ 2,637,000