Annual reports filed by certain Canadian issuers pursuant to Section 15(d) and Rule 15d-4

Income taxes (Details Textual)

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Income taxes (Details Textual) (CAD)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 47.8  
Operating Loss Carryforwards, Expiration Dates 2017 through 2032 2014 through 2032
Deferred Tax Assets, Operating Loss Carryforwards, Domestic   19.9
Percentage Of Likelihood Realized Upon Settlement 50.00%