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Segment Reporting: (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
item
Jul. 01, 2017
USD ($)
Dec. 30, 2017
USD ($)
Segment Reporting          
Number of reportable business segments | item     2    
Total revenue $ 18,159,800 $ 16,429,700 $ 36,320,800 $ 34,240,600  
Total operating income 10,074,700 8,813,100 20,148,900 18,126,500  
Total depreciation and amortization 79,300 90,200 155,100 188,700  
Total identifiable assets 48,817,000   48,817,000   $ 48,842,000
Operating | Franchising          
Segment Reporting          
Total revenue 13,302,700 12,483,100 25,934,900 24,434,400  
Total operating income 7,407,500 6,891,200 14,200,000 13,211,700  
Total depreciation and amortization 60,700 69,100 117,900 144,900  
Total identifiable assets 3,814,000   3,814,000   4,051,400
Operating | Leasing          
Segment Reporting          
Total revenue 4,857,100 3,946,600 10,385,900 9,806,200  
Total operating income 2,667,200 1,921,900 5,948,900 4,914,800  
Total depreciation and amortization 18,600 $ 21,100 37,200 $ 43,800  
Total identifiable assets 44,552,300   44,552,300   42,153,600
Unallocated          
Segment Reporting          
Total identifiable assets $ 450,700   $ 450,700   $ 2,637,000