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Redeemable Common Stock and Stock Purchase Warrants (Tables) | 9 Months Ended
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Jan. 31, 2014
Redeemable 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:
|  | January 31, |  | April 30, |
|  | 2014 |  | 2013 |
Expected term in years |  |  | 2.2 & 3.9 |  |  | 2.9 & 4.7 |
Risk-free interest rates |  |  | 0.7% & 1.5% |  |  | 0.3% |
Volatility |  |  | 93% & 107% |  |  | 95% & 98% |
Dividend yield. |  |  | 0% |  |  | 0%

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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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