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Trade Accounts and Bills Payable (Tables)
 9 Months Ended
Sep. 30, 2019
Trade Accounts and Bills Payable [Abstract]  
Schedule of trade accounts and bills payable

   December 31,   September 30, 
   2018   2019 
Trade accounts payable  $23,134,269   $24,946,847 
Bills payable          
-      Bank acceptance bills (Notes 1 and 12)   28,911,556    13,921,571 
-      Commercial acceptance bills   449,238    - 
   $52,495,063   $38,868,418