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Construction in Progress (Tables)
 3 Months Ended
Mar. 31, 2019
Construction in Progress [Abstract]  
Schedule of construction in progress
   December 31,   March 31, 
   2018   2019 
Construction in progress  $23,562,557   $20,033,557 
Prepayment for acquisition of property, plant and equipment   1,439,256    938,402 
Carrying amount  $25,001,813   $20,971,959