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1. BASIS OF PRESENTATION AND CONSOLIDATION (Tables)
3 Months Ended
Mar. 31, 2017
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

March 31,

      2017       2016  
Numerator                
Net income   $ 8,075,120     $ 6,466,964  
                 
Denominator                
Basic: Weighted-average common shares outstanding during the period      46,793,791       46,007,120  
Add: Dilutive effect of stock options     10,450       733,206  
Diluted     46,804,241       46,740,326  
                 
Net income per share                
Basic   $ 0.17     $ 0.14  
Diluted   $ 0.17     $ 0.14