Contract Liabilities: Activity (Details) - USD ($)	6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022
Activity of the current and noncurrent deferred franchise revenue
Balance at beginning of period	$ 8,618,100	$ 8,508,500
Franchise and software license fees collected from franchisees, excluding amount earned as revenue during the period	1,349,500	937,900
Fees earned that were included in the balance at the beginning of the period	(951,600)	(966,100)
Balance at end of period	$ 9,016,000	$ 8,480,300