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Investment in Leasing Operations: Summary of Leasing Operations (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Direct financing and sales-type leases:    
Minimum lease payments receivable $ 39,565,600 $ 37,839,800
Estimated residual value of equipment 4,797,600 4,754,200
Unearned lease income net of initial direct costs deferred (5,734,900) (5,844,500)
Security deposits (4,504,700) (4,424,400)
Equipment installed on leases not yet commenced 7,113,000 9,961,600
Total investment in direct financing and sales-type leases 41,236,600 42,286,700
Allowance for credit losses (883,600) (896,000)
Net investment in direct financing and sales-type leases 40,353,000 41,390,700
Operating leases:    
Operating lease assets 1,494,000 800,700
Less accumulated depreciation and amortization (1,286,500) (775,900)
Net investment in operating leases 207,500 24,800
Total net investment in leasing operations 40,560,500 41,415,500
Net investment in leases - current 16,311,000 17,004,800
Net investment in leases - long-term $ 24,249,500 $ 24,410,700