Commitments And Contingencies (Schedule Of Future Minimum Rental Payments Under Operating Leases) (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Commitments And Contingencies [Abstract]
Sublease arrangement, monthly rental payments	$ 13,554
Sublease arrangement, percentage of escalation with each anniversary date	2.50%
2015	1,518,000
2016	1,595,000
2017	982,000
2018	103,000
2019	103,000
Thereafter	103,000
Total	4,404,000
2015	163,000
2016	168,000
2017	14,000
Total	345,000
Rent expense	$ 1,200,000	$ 1,500,000	$ 1,600,000