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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, plant and equipment |  |  |
Interest expense capitalized | $ 87,478 | $ 1,757,547 | $ 2,825,879
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 |  |

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- Definition Amount of interest capitalized during the period. + References Reference 1: 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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- References No definition available. + Details
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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. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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