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Net Income (loss) per share (Tables)
12 Months Ended
Dec. 31, 2017
Net Income Loss Per Share Tables  
Net Income (loss) per share

    2017     2016     2015  
Comprehensive Income/(loss) for the year   $ (8,970,398 )   $ (9,099,562 )   $ 10,540,228  
                         
Weighted average number of shares outstanding for the year:                        
Basic     54,523,113       53,526,155       47,782,647  
Additional shares related to assumed                        
Exercise of Stock options under the                        
Treasury stock method (see (i))     -       -       1,258,736  
                         
Diluted     54,523,113       53,526,155       49,041,383  
                         
Net Income (loss) per share – Basic   $ (0.16 )   $ (0.17 )   $ 0.22  
Net Income (loss) per share – Diluted   $ (0.16 )   $ (0.17 )   $ 0.21