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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Concentration of Credit Risk) (Details) - USD ($)	Dec. 31, 2016		Dec. 31, 2015
Concentration of credit risk
Accounts receivable, allowance for doubtful accounts	$ 10,163		$ 1,087,465
Accounts receivable	4,836,499		19,849,608
Customer A [Member]
Concentration of credit risk
Accounts receivable	1,576,400			[1]
Customer B [Member]
Concentration of credit risk
Accounts receivable	1,368,956			[1]
Customer C [Member]
Concentration of credit risk
Accounts receivable	1,294,342		2,996,042
Customer D [Member]
Concentration of credit risk
Accounts receivable		[1]	6,354,510
Customer F [Member]
Concentration of credit risk
Accounts receivable		[1]	2,315,035
Customer G [Member]
Concentration of credit risk
Accounts receivable		[1]	$ 2,299,732
[1] Represents less than 10%

X

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524

+ Details

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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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