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Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) (USD $)
 12 Months Ended
Apr. 30, 2014
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 1 $ 0.47
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 2 126,270
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 3 98,491
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 4 126,270
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 5 98,491
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 6 0.60
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 7 359,456
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 8 233,646
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 9 359,456
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 10 233,646
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 11 1.12
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 12 150,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 13 19,500
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 14 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 15 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 16 1.23
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 17 100,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 18 2,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 19 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 20 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 21 1.31
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 22 600,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 23 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 24 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 25 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 26 1.41
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 27 100,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 28 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 29 12,500
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 30 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 31 1.44
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 32 114,583
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 33 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 34 29,166
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 35 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 36 1.70
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 37 650,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 38 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 39 379,166
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 40 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 41 1.88
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 42 30,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 43 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 44 10,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 45 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 46 1.90
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 47 868,230
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 48 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 49 427,084
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 50 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 51 2.00
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 52 12,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 53 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 54 12,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 55 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 56 2.15
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 57 240,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 58 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 59 240,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 60 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 61 2.27
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 62 50,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 63 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 64 38,542
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 65 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 66 2.90
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 67 305,000
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 68 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 69 133,437
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 70 0
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 71 3,705,539
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 72 353,637
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 73 1,767,621
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 74 332,137
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 75 3,930,818
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 76 2,636,687
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 77 2,677,887
Common Stock Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 78 $ 2,464,253