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Deferred Tax Liability, Net (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Summary of deferred tax liability    
Deferred tax asset - current (accrual of employee social insurance) $ 640,322 $ 167,980
Deferred tax liability - current (net investment in sales-type leases) (1,520,537) (1,265,091)
Deferred tax liability, net of current deferred tax asset (880,215) (1,097,111)
Deferred tax asset - noncurrent (depreciation of fixed assets) 10,250,394 10,322,245
Deferred tax liability - noncurrent (net investment in sales-type leases) (11,527,593) (12,290,486)
Deferred tax liability, net of noncurrent deferred tax asset (1,277,199) (1,968,241)
Total Deferred tax liability, noncurrent per ASU 2015-17 $ (2,157,414) $ (3,065,352)