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Investment in Sales-Type Leases, Net (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Investments [Abstract]    
Total future minimum lease payments receivable $ 88,661,266 $ 99,155,214
Less: executory cost (5,687,704) (6,360,901)
Less: unearned interest (19,398,707) (23,730,094)
Less: realized interest income but not yet received (9,336,141) (9,619,278)
Less: allowance for net investment receivable (29,276,658) (1,802,822)
Investment in sales-type leases, net 24,962,056 57,642,119
Current portion 11,531,745
Noncurrent portion $ 24,962,056 $ 46,110,374