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Investment in Sales-Type Leases, Net (Tables)
3 Months Ended
Mar. 31, 2018
Investment in Sales-Type Leases, Net [Abstract]  
Schedule of net investment in sales-type leases
    2018     2017  
Total future minimum lease payments receivable   $ 227,863,380     $ 218,176,104  
Less: executory cost     (69,291,742 )     (66,443,813 )
Less: unearned interest     (28,842,316 )     (33,638,086 )
Less: realized interest income but not yet received     (10,871,828 )     (6,450,202 )
Less: allowance for net investment receivable     (1,976,750 )        
Investment in sales-type leases, net     116,880,744       111,644,003  
Current portion     14,462,637       11,034,452  
Noncurrent portion   $ 102,418,107     $ 100,609,551  
Schedule of future minimum rentals to be received on non-cancelable sales-type leases by years
2019   $ 43,576,604  
2020     20,889,274  
2021     22,603,270  
2022     22,680,747  
2023     21,224,190  
Thereafter     96,889,295  
Total   $ 227,863,380