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Investment in Sales-Type Leases, Net (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Investments [Abstract]    
Total future minimum lease payments receivable $ 57,311,592 $ 88,661,266
Less: executory cost (3,676,593) (5,687,704)
Less: unearned interest (15,125,460) (19,398,707)
Less: realized interest income but not yet received (5,322,686) (9,336,141)
Less: allowance for net investment receivable (22,071,360) (29,276,658)
Investment in sales-type leases, net 11,115,493 24,962,056
Current portion
Noncurrent portion $ 11,115,493 $ 24,962,056