Trade accounts and bills payable (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Other Short-term Loan [Table Text Block]

		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