Stock Compensation Information (Summary Of Stock Option Activity) (Details) (USD $)	3 Months Ended			12 Months Ended
	Jul. 31, 2014		Jul. 31, 2013	Apr. 30, 2014
Stock Compensation Information [Abstract]
Shares, Outstanding at April 30, 2014	1,254,629
Shares, Granted	196,922
Shares, Exercised	0		0
Shares, Cancelled/expired	(97,398)
Shares, Outstanding at July 31, 2014	1,354,153			1,254,629
Shares, Exercisable at July 31, 2014	882,961
Weighted average exercise price, Outstanding at April 30, 2014	$ 2.38
Weighted average exercise price, Exercised
Weighted average exercise price, Outstanding at July 31, 2014	$ 2.26			$ 2.38
Weighted average exercise price, Exercisable at July 31, 2014	$ 2.80
Weighted average remaining contractual term (in years), Outstanding	6 years 11 months 1 day			6 years 9 months 26 days
Weighted average remaining contractual term (in years), Exercisable at July 31, 2014	5 years 9 months 4 days
Aggregate intrinsic value, Outstanding	$ 14,612	[1]		$ 41,972	[1]
Aggregate intrinsic value, Exercisable at July 31, 2014	$ 2,631	[1]

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