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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%

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