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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Property, Plant and Equipment) (Details)	12 Months Ended
	Dec. 31, 2020
Buildings and plant [Member]
Property, plant and equipment
Estimated useful lives	30 years
Machine and equipment
Property, plant and equipment
Estimated useful lives	15 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment
Estimated useful lives	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment
Estimated useful lives	5 years
Vehicles [Member]
Property, plant and equipment
Estimated useful lives	6 years

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- 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.

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