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Deferred Tax Liability, Net (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Summary of deferred tax liability    
Deferred tax asset - current (accrual of employee social insurance) $ 164,775 $ 98,372
Deferred tax liability - current (net investment in sales-type leases) (1,696,982) (1,636,477)
Deferred tax liability, net of deferred tax asset - current (1,532,207) (1,538,105)
Deferred tax asset - noncurrent (depreciation of fixed assets) 22,300,630 22,498,560
Deferred tax liability - noncurrent (net investment in sales-type leases) (32,992,349) (33,269,908)
Deferred tax liability, net of deferred tax asset - noncurrent $ (10,691,719) $ (10,771,348)