Investment in Leasing Operations: Leasing Income (Details) - USD ($)	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Leasing income
Interest income on direct financing and sales-type leases	$ 1,755,200	$ 3,651,700	$ 7,602,600
Selling profit (loss) at commencement of sales-type leases	1,829,800	2,117,500	2,470,300
Operating lease income	2,017,300	2,346,500	2,525,600
Income on sales of equipment under lease	4,799,400	5,246,000	2,855,400
Other	746,600	1,122,300	601,900
Leasing income	$ 11,148,300	$ 14,484,000	$ 16,055,800