Share-Based Payments (Details 3) (Warrant [Member], USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Jan. 31, 2015	Apr. 30, 2014
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, May 1, 2014	3,276,667
Number of Shares, Granted	0
Number of Shares, Exercised	0
Number of Shares, Expired	(150,000)
Number of Shares, Ending Balance	3,126,667	3,276,667
Weighted Average Exercise Price, Beginning Balance	$ 0.61
Weighted Average Exercise Price, Granted	$ 0
Weighted Average Exercise Price, Exercised	$ 0
Weighted Average Exercise Price, Expired	$ 0
Weighted Average Exercise Price, Ending Balance	$ 0.60	$ 0.61
Weighted Average Remaining Contractual Life (Years), Balance	2 years 3 months 18 days	2 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 984
Aggregate Intrinsic Value, Outstanding, Ending Balance	$ 0	$ 984