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Investment in and advances to unconsolidated joint venture (Details) (CAD)
0 Months Ended 12 Months Ended
Sep. 30, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 25, 2011
joint_venture_partner
Schedule of Equity Method Investments [Line Items]          
Proceeds on the wind up of the JV   2,170,000 0 0  
Investment in and advances to unconsolidated joint venture   0 1,574,000    
Condensed financial data for investment in and advances to unconsolidated joint venture [Abstract]          
Equity in (earnings) loss of unconsolidated joint venture (note 9)   (596,000) (86,000) 2,720,000  
Noramac Joint Venture
         
Schedule of Equity Method Investments [Line Items]          
Proportionate interest in Noramac Joint Venture (percent)         50.00%
Ownership interest in Noramac Ventures (percent)         49.00%
Number of joint venture partners         2
Proceeds on the wind up of the JV 2,170,000        
Investment in and advances to unconsolidated joint venture   0 1,574,000    
Condensed financial data for investment in and advances to unconsolidated joint venture [Abstract]          
Current assets   0 6,556,000    
Current liabilities   0 10,716,000    
Gross revenues   1,192,000 1,922,000 12,196,000  
Gross (profit) loss   (1,192,000) (1,922,000) 2,483,000  
Net (income) loss   (1,192,000) (172,000) 5,440,000  
Equity in (earnings) loss of unconsolidated joint venture (note 9)   (596,000) (86,000) 2,720,000