Stock Compensation Information (Summary Of Stock Option Activity) (Details) - USD ($)		3 Months Ended		12 Months Ended
		Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015
Stock Compensation Information [Abstract]
Shares, Outstanding at April 30, 2014		1,849,721
Shares, Exercised			0
Shares, Cancelled/expired		(186,514)
Shares, Outstanding at April 30, 2015		1,663,207		1,849,721
Shares, Exercisable at April 30, 2015		655,529
Weighted average exercise price, Outstanding at April 30, 2014		$ 1.67
Weighted average exercise price, Exercised
Weighted average exercise price, Outstanding at April 30, 2015		$ 1.60		$ 1.67
Weighted average exercise price, Exercisable at April 30, 2015		$ 2.76
Weighted average remaining contractual term (in years), Outstanding		7 years 6 months 26 days		7 years 7 months 13 days
Weighted average remaining contractual term (in years), Exercisable at April 30, 2015		5 years 1 month 21 days
Aggregate intrinsic value, Outstanding	[1]			$ 56,395

[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.