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Construction in Progress (Tables)
 3 Months Ended
Mar. 31, 2020
Construction in Progress [Abstract]  
Schedule of construction in progress

   December 31,   March 31, 
   2019   2020 
Construction in progress  $21,613,577   $21,710,182 
Prepayment for acquisition of property, plant and equipment   94,047    149,168 
Carrying amount  $21,707,624   $21,859,350