Significant Accounting Policies (Narrative) (Details)	9 Months Ended
	Jan. 31, 2015 USD ($)	Jan. 31, 2015 CAD
Significant Accounting Policies 1	$ 6,339,717
Significant Accounting Policies 2		6,704,947
Significant Accounting Policies 3	2,083,960
Significant Accounting Policies 4		2,083,752
Significant Accounting Policies 5	5,296,167
Significant Accounting Policies 6		6,704,947
Significant Accounting Policies 7	6,117,653
Significant Accounting Policies 8	1,645,666
Significant Accounting Policies 9		2,083,414
Significant Accounting Policies 10	$ 1,900,925
Significant Accounting Policies 11	5,759,630	5,759,630
Significant Accounting Policies 12	4,834,230	4,834,230