Revenues (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Sales Revenue By Product [Line Items]
Total Revenue	$ 301,466,007	$ 310,453,033
Modified Polyamide 66 PA66 [Member]
Sales Revenue By Product [Line Items]
Total Revenue	83,878,245	81,785,392
Modified Polyamide 6 PA6 [Member]
Sales Revenue By Product [Line Items]
Total Revenue	66,168,094	64,041,001
Plastic Alloy [Member]
Sales Revenue By Product [Line Items]
Total Revenue	63,136,625	78,566,416
Modified Polypropylene PP [Member]
Sales Revenue By Product [Line Items]
Total Revenue	37,057,054	50,215,551
Modified Acrylonitrile Butadiene Styrene ABS [Member]
Sales Revenue By Product [Line Items]
Total Revenue	13,447,629	8,596,982
Polyoxymethylenes POM [Member]
Sales Revenue By Product [Line Items]
Total Revenue	2,596,461	2,123,385
Polyphenylene Oxide PPO [Member]
Sales Revenue By Product [Line Items]
Total Revenue	16,859,150	4,169,561
Polylactide PLA [Member]
Sales Revenue By Product [Line Items]
Total Revenue	16,511,356	20,881,846
Polyethylene (PE) [Member]
Sales Revenue By Product [Line Items]
Total Revenue	1,772,744
Raw Materials [Member]
Sales Revenue By Product [Line Items]
Total Revenue	38,649	72,899
Distributors [Member]
Sales Revenue By Product [Line Items]
Total Revenue	282,883,471	303,538,842
Direct customers [Member]
Sales Revenue By Product [Line Items]
Total Revenue	282,883,471	6,841,292
Others [Member]
Sales Revenue By Product [Line Items]
Total Revenue	$ 38,649	$ 72,899