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11. Net income (loss) per common share (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net Income Loss Per Common Share Details    
Net income (loss) $ 143,530 $ (355,629)
Basic earnings per share, Amount $ 143,530  
Basic earnings per share, Shares 47,738,855  
Basic earnings per share, Per share amount $ 0.00 $ (0.01)
Effect of dilutive securities    
Warrants, Amount  
Warrants, Shares 266,700  
Options  
Diluted earnings per share, Amount $ 143,350  
Diluted earnings per share, Shares $ 48,005,555  
Diluted earnings per share, Per share amount $ 0.00 $ (0.01)