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Income (loss) per share (Tables)
12 Months Ended
Dec. 31, 2012
Income Loss Per Share Tables  
Income (loss) per share
    2012     2011     2010  
                   
Net income (loss) for the year   $ 2,062,728     $ (3,584,601 )   $ (4,452,428 )
                         
Weighted average number of common shares outstanding                        
 Basic     40,453,392       35,696,620       32,774,974  
 Additional shares related to assumed exercise of                        
    stock options under treasury stock method     337,070       -          
 Contingently issuable preferred shares     8,000,000       -          
 Diluted     48,790,462       35,696,620       32,774,974  
                         
Income (loss) per share - Basic   $ 0.05     $ (0.10 )   $ (0.14 )
Income (loss) per share - Diluted   $ 0.04     $ (0.10 )   $ (0.14 )