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Prepayments and Other Current Assets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Summary of prepayments and other current assets    
Prepaid land lease $ 437,114 $ 459,123
Value-added tax recoverable 5,760,280
Prepayment for purchase of materials 183,649
Others 43,905 8,751
Total prepayments and other current assets $ 6,241,299 $ 651,523