Investment in Leasing Operations: Summary of Leasing Operations (Details) - USD ($)	Jun. 30, 2018	Dec. 30, 2017
Direct financing and sales-type leases:
Minimum lease payments receivable	$ 42,666,700	$ 36,119,700
Estimated residual value of equipment	3,830,400	4,762,700
Unearned lease income net of initial direct costs deferred	(7,727,200)	(5,371,900)
Security deposits	(4,039,700)	(4,526,000)
Equipment installed on leases not yet commenced	9,363,000	10,989,700
Total investment in direct financing and sales-type leases	44,093,200	41,974,200
Allowance for credit losses	(755,900)	(711,200)
Net investment in direct financing and sales-type leases	43,337,300	41,263,000
Operating leases:
Operating lease assets	1,370,900	1,045,400
Less accumulated depreciation and amortization	(1,281,700)	(1,030,800)
Net investment in operating leases	89,200	14,600
Total net investment in leasing operations	43,426,500	41,277,600
Net investment in leases - current	17,046,100	15,332,300
Net investment in leases - long-term	$ 26,380,400	$ 25,945,300