Stock options (Details 2)	12 Months Ended		12 Months Ended
Dec. 31, 2014 CAD	Dec. 31, 2013 CAD	Dec. 31, 2012 CAD	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Stock Option [Member] CAD	Dec. 31, 2013 Stock Option [Member] CAD	Dec. 31, 2012 Stock Option [Member] CAD
Expected dividends paid per common share						0	0
Expected life in years					5 years	5 years	4 years
Expected volatility in the price of common shares					113.00%	74.00%	79.00%
Risk free interest rate		1.00%	1.20%		1.50%	1.00%	1.00%
Weighted average fair market value per share at grant date				$ 0.08us-gaap_SharePrice	1.24	0.55	0.52
Intrinsic (or "in-the-money") value per share of options exercised					0.85	0.76	0.13

Agreed upon price for the exchange of the underlying asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueAssumptionsExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of dividends expected to be paid to holders of the underlying shares or contracted instruments over the term of the instruments life.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedDividendPayments
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsExpectedTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average expected volatility of stock price.

+ References

+ Details

Name:	us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant