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Deferred Tax Liability, Net (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Summary of deferred tax liability    
Deferred tax asset - current (accrual of employee social insurance) $ 187,255 $ 189,617
Deferred tax liability - current (net investment in sales-type leases) (1,597,776) (1,520,538)
Deferred tax liability, net of current deferred tax asset (1,410,521) (1,330,921)
Deferred tax asset - noncurrent (depreciation of fixed assets) 9,590,713 10,250,395
Deferred tax asset - noncurrent (asset impairment loss) 879,480 450,706
Deferred tax asset - noncurrent (interest income receivable in sales-type leases) (10,560,354) (11,527,594)
Deferred tax liability, net of noncurrent deferred tax asset (90,159) (826,493)
Total Deferred tax liability, noncurrent per ASU 2015-17 $ (1,500,680) $ (2,157,414)