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Trade accounts and bills payable
 12 Months Ended
Dec. 31, 2017
Trade accounts and bills payable [Text Block]
13.

Trade accounts and bills payable

Trade accounts and bills payable as of September 30, 2016, December 31, 2016 and 2017 consisted of the followings:

    September 30,     December 31,     December 31,  
    2016     2016     2017  
Trade accounts payable $ 7,665,644   $ 8,308,753   $ 29,805,350  
Bills payable                  
-    Bank acceptance bills   6,835,451     6,128,310     34,025,080  
-    Commercial acceptance bills   4,050,741     1,143,592     1,786,113  
  $ 18,551,836   $ 15,580,655   $ 65,616,543  

All the bills payable are of trading nature and will mature within six months to one year from the issue date.

The bank acceptance bills were pledged by:

  (i)

the Company’s bank deposits (Note 4);and
     
  (ii)

$nil, $nil and $19,047,471 of the Company’s bills receivable as of September 30, 2016, December 31, 2016 and 2017, respectively (Note 5).