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1. BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2015
Accounting Policies [Abstract]  
Schedule of property plant and equipment useful life
   

Useful life

(in years) 

Buildings (including salt pans)   8 - 20
Plant and machinery (including protective shells, transmission channels and ducts)   3 - 8
Motor vehicles   5
Furniture, fixtures and equipment   3-8
Schedule of earnings per share
    Three-Month Period Ended June 30,     Six-Month Period Ended June 30,
    2015     2014       2015       2014  
Numerator                            
Net income   $ 10,775,260     $ 5,664,812     $ 16,090,531     $ 9,951,150  
                                 
Denominator                                
Basic: Weighted-average common shares outstanding during the period     45,928,234       38,726,415       44,313,537       38,662,773  
Add: Dilutive effect of stock options     1,214,839       614,813       1,005,671       647,173  
Diluted     47,143,073       39,341,228       45,319,208       39,309,946  
                                 
Net income per share                                
Basic   $ 0.23     $ 0.15     $ 0.36     $ 0.26  
Diluted   $ 0.23     $ 0.14     $ 0.36     $ 0.25