Common Stock (Narrative) (Details)	6 Months Ended
	Oct. 31, 2013 USD ($) Y M	Oct. 31, 2013 CAD
Common Stock 1	12.50%	12.50%
Common Stock 2	42	42
Common Stock 3	6,860,000	6,860,000
Common Stock 4	718	718
Common Stock 5	15.00%	15.00%
Common Stock 6	$ 0.89
Common Stock 7	2.90
Common Stock 8	$ 1.20
Common Stock 9	1.87
Common Stock 10	1,623,338	1,623,338
Common Stock 11	2,096,096	2,096,096
Common Stock 12	168,839
Common Stock 13	238,038
Common Stock 14	280,074
Common Stock 15	320,694
Common Stock 16	1,727,835
Common Stock 17	3	3
Common Stock 18	50,000	50,000
Common Stock 19	7,000	7,000
Common Stock 20	2.25
Common Stock 21	110,103	110,103
Common Stock 22	110,103	110,103
Common Stock 23	1.75
Common Stock 24	93,057
Common Stock 25	1,311,141
Common Stock 26	3,773,946
Common Stock 27	6.00%	6.00%
Common Stock 28	50.00%	50.00%
Common Stock 29	3.00%	3.00%
Common Stock 30	26,106
Common Stock 31	56,250
Common Stock 32	700,000	700,000
Common Stock 33	556,401	556,401
Common Stock 34	48,222	48,222
Common Stock 35	61,622	61,622
Common Stock 36	1,995,414	1,995,414
Common Stock 37	2,462,365	2,462,365
Common Stock 38	72,292	72,292
Common Stock 39	1.99
Common Stock 40		1.98
Common Stock 41	143,861
Common Stock 42	154,836	154,836
Common Stock 43	1.77
Common Stock 44		1.83
Common Stock 45	274,060
Common Stock 46	202,308	202,308
Common Stock 47	24,820	24,820
Common Stock 48	5.00%	5.00%
Common Stock 49	2,500,000	2,500,000
Common Stock 50	191,066	191,066
Common Stock 51	133,443	133,443
Common Stock 52	75,417	75,417
Common Stock 53	115,649	115,649
Common Stock 54	587,427	587,427
Common Stock 55	297,160
Common Stock 56	$ 361,356
Common Stock 57	1.94	1.94
Common Stock 58	2.02	2.02