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Investment in Sales-Type Leases, Net (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Investment in Sales-Type Leases, Net [Abstract]    
Total future minimum lease payments receivable $ 203,269,139 $ 222,132,929
Less: executory cost (62,014,131) (67,212,769)
Less: unearned interest (24,873,815) (29,542,876)
Less: realized interest income but not yet received (9,315,463) (9,869,358)
Less: allowance for net investment receivable (4,839,392) (1,802,822)
Investment in sales-type leases, net 102,226,338 113,705,104
Current portion 12,689,105 13,076,516
Noncurrent portion $ 89,537,233 $ 100,628,588