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Segment Reporting: (Details)
 12 Months Ended
Dec. 26, 2020
USD ($)
item
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
Segment Reporting      
Number of reportable business segments | item 2    
Total revenue $ 66,061,800 $ 73,298,900 $ 72,511,100
Total operating income 40,211,500 43,131,100 41,763,800
Total depreciation and amortization 484,700 400,100 314,100
Total identifiable assets 31,343,200 61,842,200  
Franchising | Canadian operations      
Segment Reporting      
Total revenue 4,000,000.0 4,700,000 4,400,000
Operating | Franchising      
Segment Reporting      
Total revenue 51,577,800 57,243,100 54,334,600
Total operating income 31,880,200 35,169,900 31,882,200
Total depreciation and amortization 285,300 281,600 240,500
Total identifiable assets 4,848,300 3,736,000  
Operating | Leasing      
Segment Reporting      
Total revenue 14,484,000 16,055,800 18,176,500
Total operating income 8,331,300 7,961,200 9,881,600
Total depreciation and amortization 199,400 118,500 $ 73,600
Total identifiable assets 14,462,600 26,596,700  
Unallocated      
Segment Reporting      
Total identifiable assets $ 12,032,300 $ 31,509,500