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Investment in Leasing Operations: Minimum Lease Payments Receivable (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Direct Financing and Sales-Type Leases, Minimum Lease Payments Receivable    
2017 $ 6,461,600  
2018 19,175,400  
2019 11,561,600  
2020 2,343,000  
2021 12,800  
Thereafter 11,200  
Total 39,565,600 $ 37,839,800
Direct Financing and Sales-Type Leases, Income Amortization    
2017 1,341,400  
2018 3,300,600  
2019 1,017,200  
2020 74,000  
2021 1,200  
Thereafter 500  
Total 5,734,900  
Operating Leases, Minimum Lease Payments Receivable    
Total $ 0