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Redeemable Common Stock and Stock Purchase Warrant (Tables)

6 Months Ended

Oct. 31, 2012

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:

		October 31,				April 30,
		2012				2012
Expected term in years			3.4				3.9
Risk-free interest rates			0.5	%			0.6	%
Volatility			83	%			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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