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Investment in Sales-Type Leases, Net (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Investments [Abstract]    
Total future minimum lease payments receivable $ 58,513,403 $ 88,661,266
Less: executory cost (3,753,690) (5,687,704)
Less: unearned interest (15,442,638) (19,398,707)
Less: realized interest income but not yet received (5,434,301) (9,336,141)
Less: allowance for net investment receivable (22,534,192) (29,276,658)
Investment in sales-type leases, net 11,348,582 24,962,056
Current portion
Noncurrent portion $ 11,348,582 $ 24,962,056