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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 $ 88,455,053 $ 99,155,214
Less: executory cost (5,674,474) (6,360,901)
Less: unearned interest (19,883,742) (23,730,094)
Less: realized interest income but not yet received (8,784,273) (9,619,278)
Less: allowance for net investment receivable (4,839,392) (1,802,822)
Investment in sales-type leases, net 49,273,172 57,642,119
Current portion 10,304,074 11,531,745
Noncurrent portion $ 38,969,098 $ 46,110,374