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Prepayments and Other Current Assets
3 Months Ended
Mar. 31, 2022
Prepaid Expenses And Other Current Assets Disclosure [Abstract]  
Prepayments and other current assets

(5) Prepayments and other current assets

 

Prepayments and other current assets consisted of the following as of March 31, 2022 and December 31, 2021:

 

   March 31,   December 31, 
   2022   2021 
Prepaid land lease  $189,030   $188,215 
Prepayment for purchase of materials   6,965,186    9,190,527 
Prepayment for purchase of equipment   1,114,206    980,786 
Value-added tax recoverable   14,735,418    14,740,296 
Others   21,349    696,816 
   $23,025,189   $25,796,640