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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Capital commitments:      
Commitments outstanding for the purchase of property, plant and equipment $ 39,900,000    
Lease commitments:      
Lease expense 1,014,556 $ 1,024,970 $ 1,050,661
2018 1,058,012    
2019 11,925    
Total $ 1,069,937