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Investment in Leasing Operations: Minimum Lease Payments Receivable (Details) - USD ($)
Mar. 31, 2018
Dec. 30, 2017
Direct Financing and Sales-Type Leases, Minimum Lease Payments Receivable    
2018 $ 17,724,200  
2019 19,073,800  
2020 5,648,100  
2021 127,000  
2022 13,700  
Thereafter 12,400  
Total 42,599,200 $ 36,119,700
Direct Financing and Sales-Type Leases, Income Amortization    
2018 4,697,000  
2019 3,247,400  
2020 274,000  
2021 2,500  
2022 1,300  
Thereafter 600  
Total 8,222,800  
Operating Leases, Minimum Lease Payments Receivable    
2018 126,400  
2019 76,900  
Total $ 203,300