Segment Reporting: (Details)	3 Months Ended
	Mar. 30, 2019 USD ($) item	Mar. 31, 2018 USD ($)	Dec. 29, 2018 USD ($)
Segment Reporting
Number of reportable business segments | item	2
Total revenue	$ 18,331,200	$ 18,161,000
Total operating income	10,066,500	10,074,200
Total depreciation and amortization	80,100	75,800
Total identifiable assets	46,831,800		$ 46,663,100
Operating | Franchising
Segment Reporting
Total revenue	13,175,900	12,632,200
Total operating income	7,498,000	6,792,500
Total depreciation and amortization	62,500	57,200
Total identifiable assets	4,081,800		5,208,400
Operating | Leasing
Segment Reporting
Total revenue	5,155,300	5,528,800
Total operating income	2,568,500	3,281,700
Total depreciation and amortization	17,600	$ 18,600
Total identifiable assets	36,464,000		40,490,000
Unallocated
Segment Reporting
Total identifiable assets	$ 6,286,000		$ 964,700