Annual report pursuant to Section 13 and 15(d)

Income taxes (Details Textual)

v2.4.0.8
Income taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
United States [Member]
Dec. 31, 2013
CANADA
Deferred Tax Assets, Operating Loss Carryforwards, Foreign $ 54.4      
Deferred Tax Assets, Operating Loss Carryforwards, Domestic   22.0    
Percentage Of Likelihood Realized Upon Settlement 50.00%      
Operating Loss Carryforward Expiration Date     2017 through 2033 2014 through 2033
Asset Retirement Obligation, Current $ 5.7