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Segment Reporting: (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
item
Apr. 01, 2017
USD ($)
Dec. 30, 2017
USD ($)
Segment Reporting      
Number of reportable business segments | item 2    
Total revenue $ 18,161,000 $ 17,810,900  
Total operating income 10,074,200 9,313,400  
Total depreciation and amortization 75,800 98,500  
Total identifiable assets 47,724,800   $ 48,842,000
Operating | Franchising      
Segment Reporting      
Total revenue 12,632,200 11,951,300  
Total operating income 6,792,500 6,320,500  
Total depreciation and amortization 57,200 75,800  
Total identifiable assets 3,267,400   4,051,400
Operating | Leasing      
Segment Reporting      
Total revenue 5,528,800 5,859,600  
Total operating income 3,281,700 2,992,900  
Total depreciation and amortization 18,600 $ 22,700  
Total identifiable assets 44,003,500   42,153,600
Unallocated      
Segment Reporting      
Total identifiable assets $ 453,900   $ 2,637,000