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Deferred Tax Liability, Net (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Summary of deferred tax liability    
Deferred tax asset - current (accrual of employee social insurance) $ 197,038 $ 189,617
Deferred tax liability - current (net investment in sales-type leases) (2,070,534) (1,828,246)
Deferred tax liability, net of current deferred tax asset (1,873,496) (1,638,629)
Deferred tax asset - noncurrent (depreciation of fixed assets) 17,958,810 17,709,919
Deferred tax asset - noncurrent (asset impairment loss) 494,187 450,706
Deferred tax liability - noncurrent (net investment in sales-type leases) (25,604,527) (25,157,147)
Deferred tax liability, net of noncurrent deferred tax asset (7,151,530) (6,996,522)
Total Deferred tax liability, noncurrent per ASU 2015-17 $ (9,025,026) $ (8,635,151)