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Investment in Sales-Type Leases, Net (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Investment in Sales-Type Leases, Net [Abstract]    
Total future minimum lease payments receivable $ 99,155,214 $ 96,886,262
Less: executory cost (6,360,901) (6,215,345)
Less: unearned interest (23,730,094) (28,785,901)
Less: realized interest income but not yet received (9,619,278) (4,621,490)
Less: bad debt allowance for net investment receivable (1,802,822)
Investment in sales-type leases, net 57,642,119 57,263,526
Current portion 11,531,745 8,101,583
Noncurrent portion $ 46,110,374 $ 49,161,943