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Redeemable Common Stock and Stock Purchase Warrants (Tables)

12 Months Ended

Apr. 30, 2013

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:

		Year Ended April 30,
		2013		2012
Expected term in years		2.9 - 4.7		3.9
Risk-free interest rates		0.30%		0.60%
Volatility		95% - 98%		102%
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.

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