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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 $ 94,187,347 $ 99,155,214
Less: executory cost (6,042,207) (6,360,901)
Less: unearned interest (21,854,351) (23,730,094)
Less: realized interest income but not yet received (9,241,978) (9,619,278)
Less: allowance for net investment receivable (2,586,479) (1,802,822)
Investment in sales-type leases, net 54,462,332 57,642,119
Current portion 12,220,921 11,531,745
Noncurrent portion $ 42,241,411 $ 46,110,374