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Common Stock and Stock Purchase Warrants (Tables) | 12 Months Ended
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Apr. 30, 2015
Common Stock and Stock Purchase Warrant [Abstract] |
Schedule of Share-based Payment Award Stock Warrants Valuation Assumptions [Table Text Block] | Assumptions used to calculate the fair value of these warrants were as follows:
|  | Year Ended April 30, |
|  | 2015 |  | 2014 |
Expected term in years |  |  | 1.1 - 4.9 |  |  | 1.9 - 3.7 |
Risk-free interest rates |  |  | 0.5% - 1.76% |  |  | 0.4% - 1.17% |
Volatility |  |  | 73% - 107% |  |  | 95% - 113% |
Dividend yield |  |  | 0% |  |  | 0% |

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- Definition Equity-based compensation plans and award types, including multiple equity-based payment arrangements. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock warrants, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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