Stock Compensation Information (Summary Of Stock Option Activity) (Details) (USD $)	9 Months Ended			12 Months Ended
	Jan. 31, 2015		Jan. 31, 2014	Apr. 30, 2014
Stock Compensation Information [Abstract]
Shares, Outstanding at April 30, 2014	1,254,629
Shares, Granted	915,300
Shares, Exercised			0
Shares, Cancelled/expired	(322,655)
Shares, Outstanding at January 31, 2015	1,847,274			1,254,629
Shares, Exercisable at January 31, 2015	773,916
Weighted average exercise price, Outstanding at April 30, 2014	$ 2.38
Weighted average exercise price, Exercised
Weighted average exercise price, Outstanding at January 31, 2015	$ 1.69			$ 2.38
Weighted average exercise price, Exercisable at January 31, 2015	$ 2.81
Weighted average remaining contractual term (in years), Outstanding	7 years 9 months 11 days			6 years 9 months 26 days
Weighted average remaining contractual term (in years), Exercisable at January 31, 2015	5 years 3 months 29 days
Aggregate intrinsic value, Outstanding		[1]		$ 41,972	[1]

[1] Aggregate intrinsic value is defined as the difference between the current market value and the exercise price. It is estimated using the closing price of our common stock on the last trading day of the periods ended as of the dates indicated.