Segment Reporting: (Details)	3 Months Ended
	Mar. 28, 2020 USD ($) item	Mar. 30, 2019 USD ($)	Dec. 28, 2019 USD ($)
Segment Reporting
Number of reportable business segments | item	2
Total revenue	$ 18,600,000	$ 18,331,200
Total operating income	10,101,800	10,066,500
Total depreciation and amortization	123,100	80,100
Total identifiable assets	59,891,800		$ 61,842,200
Operating | Franchising
Segment Reporting
Total revenue	12,728,800	13,175,900
Total operating income	7,211,400	7,498,000
Total depreciation and amortization	72,600	62,500
Total identifiable assets	3,206,800		3,736,000
Operating | Leasing
Segment Reporting
Total revenue	5,871,200	5,155,300
Total operating income	2,890,400	2,568,500
Total depreciation and amortization	50,500	$ 17,600
Total identifiable assets	22,731,300		26,596,700
Unallocated
Segment Reporting
Total identifiable assets	$ 33,953,700		$ 31,509,500