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Trade Accounts and Bills Payable (Tables)
 12 Months Ended
Dec. 31, 2018
Trade Accounts and Bills Payable [Abstract]  
Schedule of trade accounts and bills payable
   December 31,   December 31, 
   2017    2018 
Trade accounts payable  $29,805,350   $23,134,269 
Bills payable          
– Bank acceptance bills   　34,025,080    28,911,556 
– Commercial acceptance bills   　1,786,113    449,238 
　  $65,616,543   $52,495,063