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Prepayments and Other Current Assets (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Summary of prepayments and other current assets    
Prepaid land lease $ 307,418 $ 437,114
Value-added tax recoverable 5,871,234 5,760,280
Others 35,167 43,905
Total prepayments and other current assets $ 6,213,819 $ 6,241,299