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ALLOWANCES FOR DOUBTFUL RECEIVABLES (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Analysis of allowances for accounts receivable is as follows:      
Beginning of the year $ 3,189,110 $ 7,160,782 $ 1,592,467
Allowances (Reversal) during the year (2,026,567) (3,823,744) 5,482,019
Foreign exchange effect (75,078) (147,928) 86,296
Closing balance 1,087,465 3,189,110 $ 7,160,782
Allowances reversed during the period $ 2,026,567 $ 3,823,744