Investment in Leasing Operations: Summary of Leasing Operations (Details) - USD ($)	Jun. 27, 2020	Dec. 28, 2019
Direct financing and sales-type leases:
Minimum lease payments receivable	$ 20,832,100	$ 26,001,200
Estimated unguaranteed residual value of equipment	3,340,300	4,109,800
Unearned lease income net of initial direct costs deferred	(2,350,800)	(4,039,400)
Security deposits	(2,757,300)	(3,852,000)
Equipment installed on leases not yet commenced	631,300	3,437,800
Total investment in direct financing and sales-type leases	19,695,600	25,657,400
Allowance for credit losses	(923,800)	(580,600)
Net investment in direct financing and sales-type leases	18,771,800	25,076,800
Operating leases:
Operating lease assets	612,600	820,700
Less accumulated depreciation and amortization	(543,300)	(591,900)
Net investment in operating leases	69,300	228,800
Total net investment in leasing operations	18,841,100	25,305,600
Net investment in leases - current	11,688,600	12,800,100
Net investment in leases - long-term	$ 7,152,500	$ 12,505,500