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7. Stockholders' equity (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stockholders Equity Details    
Outstanding Number Of Share, Beginning Balance 520,000 1,410,000
Granted 0 0
Exercised (515,000) (55,000)
Expired (5,000) (835,000)
Outstanding Number Of Share, Ending Balance 0 520,000
Weighted average exercise price Beginning balance $ 0.15 $ 0.19
Granted 0 0
Exercised 0.15 0.17
Expired 0.15 0.21
Weighted average exercise price, Ending balance $ 0 $ 0.15