Investment in Leasing Operations: Summary of Leasing Operations (Details) - USD ($)	Sep. 26, 2020	Dec. 28, 2019
Direct financing and sales-type leases:
Minimum lease payments receivable	$ 16,854,200	$ 26,001,200
Estimated unguaranteed residual value of equipment	2,992,600	4,109,800
Unearned lease income net of initial direct costs deferred	(1,823,600)	(4,039,400)
Security deposits	(2,637,800)	(3,852,000)
Equipment installed on leases not yet commenced	660,300	3,437,800
Total investment in direct financing and sales-type leases	16,045,700	25,657,400
Allowance for credit losses	(583,600)	(580,600)
Net investment in direct financing and sales-type leases	15,462,100	25,076,800
Operating leases:
Operating lease assets	707,100	820,700
Less accumulated depreciation and amortization	(564,200)	(591,900)
Net investment in operating leases	142,900	228,800
Total net investment in leasing operations	15,605,000	25,305,600
Net investment in leases - current	10,514,200	12,800,100
Net investment in leases - long-term	$ 5,090,800	$ 12,505,500