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Capital Stock (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2011
USD ($)
Apr. 30, 2011
CAD
Mar. 31, 2012
Jun. 30, 2012
Apr. 18, 2012
USD ($)
Mar. 13, 2012
CAD
Apr. 20, 2011
USD ($)
Apr. 20, 2011
CAD
Common stock, number of shares issued [Roll Forward]                
Issued and outstanding, beginning of period (in shares)     71,503,883 71,503,883        
Exercises of compensation options (in shares)       225,000        
Exercises of compensation warrants (in shares)       478,261        
Issued and outstanding, end of period (in shares)       72,207,144        
Public Offering [Abstract]                
Common shares purchased during public offering (in shares)             9,000,000 9,000,000
Price per share of common stock (in dollars per share)         $ 2.30 3.30 $ 3.43 3.30
Aggregate gross proceeds from issuance of stock $ 30,870,000 29,700.000            
Proceeds from issuance of stock, net of legal and regulatory fees 28,984,000              
Compensation options issued to underwriters (in shares) 450,000 450,000 225,000          
Fair value of compensation options issued $ 588,000