Investment in Leasing Operations: Minimum Lease Payments Receivable (Details) - USD ($)	Jun. 30, 2018	Dec. 30, 2017
Direct Financing and Sales-Type Leases, Minimum Lease Payments Receivable
2018	$ 12,738,700
2019	21,656,500
2020	7,581,200
2021	664,100
2022	13,700
Thereafter	12,500
Total	42,666,700	$ 36,119,700
Direct Financing and Sales-Type Leases, Income Amortization
2018	3,418,500
2019	3,855,000
2020	442,500
2021	9,300
2022	1,300
Thereafter	600
Total	7,727,200
Operating Leases, Minimum Lease Payments Receivable
2018	84,300
2019	76,900
Total	$ 161,200