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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment
Interest expense capitalized	$ 1,757,547	$ 2,825,879	$ 1,960,259
Buildings and plant [Member]
Property, plant and equipment
Estimated useful lives	30 years
Machinery and equipment [Member]
Property, plant and equipment
Estimated useful lives	15 years
Furniture, fixtures and equipment [Member] | Minimum [Member]
Property, plant and equipment
Estimated useful lives	3 years
Furniture, fixtures and equipment [Member] | Maximum [Member]
Property, plant and equipment
Estimated useful lives	5 years
Motor vehicles [Member]
Property, plant and equipment
Estimated useful lives	6 years

X

- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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