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Investment in Sales-Type Leases, Net (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Investment in Sales-Type Leases, Net [Abstract]    
Total future minimum lease payments receivable $ 214,109,061 $ 222,132,929
Less: executory cost (65,131,472) (67,212,769)
Less: unearned interest (26,622,270) (29,542,876)
Less: realized interest income but not yet received (10,295,813) (9,869,358)
Less: allowance for net investment receivable (2,586,479) (1,802,822)
Investment in sales-type leases, net 109,473,026 113,705,104
Current portion 14,234,089 13,076,516
Noncurrent portion $ 95,238,937 $ 100,628,588