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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Concentration of Credit Risk) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Concentration of credit risk |  |  |  |  |
Accounts receivable, allowance for doubtful accounts | $ 1,087,465 |  | $ 3,189,110 |  |
Accounts receivable | $ 19,849,608 |  | $ 8,714,261 |  |
Sales [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Concentration risk, percentage | 51.00% |  | 23.00% |  | 30.00%
Customer C [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable |  | [1] | $ 2,213,393 |  |
Customer J [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable | $ 2,996,042 |  | 1,578,947 |  |
Customer M [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable |  | [1] | 1,330,145 |  |
Customer H [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable | $ 6,354,510 |  | $ 1,071,415 |  |
Customer N [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable | 2,315,035 |  |  | [1] |
Customer B [Member] |  |  |  |  |
Concentration of credit risk |  |  |  |  |
Accounts receivable | $ 2,299,732 |  |  |  |
[1] | Represents less than 10%

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