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Deferred Tax Liability, Net (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Summary of deferred tax liability    
Deferred tax asset — current (accrual of employee social insurance) $ 190,376 $ 186,779
Deferred tax liability — current (net investment in sales-type leases) (789,887) (1,639,057)
Deferred tax liability — current, net of current deferred tax asset (599,511) (1,452,278)
Deferred tax asset — noncurrent (depreciation of fixed assets) 3,509,234 6,176,064
Deferred tax asset — noncurrent (asset impairment loss) 6,524,615 15,003,497
Deferred tax asset — noncurrent (capitalized interest on CIP) 2,531,120
Deferred tax asset — noncurrent (interest income in sales-type leases) 884,020 658,307
Deferred tax asset — noncurrent 3,067,507 3,114,083
Less: valuation allowance on deferred tax assets (16,785,603) (21,353,059)
Deferred tax assets — noncurrent, net 6,172,288 7,747,873
Deferred tax liability — noncurrent (net investment in sales-type leases) (6,136,086) (9,335,941)
Deferred tax liability — noncurrent, net of noncurrent deferred tax assets 36,202 (1,588,068)
Total Deferred tax liability, noncurrent per ASU 2015-17 (563,309) (3,040,346)
PRC [Member]    
Summary of deferred tax liability    
Deferred tax asset — noncurrent $ 8,972,515 $ 1,617,861