Commitments and Contingencies Schedule of Future Minimum Lease Payments (Details) (USD $)	Apr. 30, 2012	Apr. 30, 2011
Capital Lease Obligations [Member]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	$ 44,000
Capital Leases, Future Minimum Payments Due in Two Years	28,000
Capital Leases, Future Minimum Payments Due in Three Years	4,000
Capital Leases, Future Minimum Payments Due	76,000
Operating Lease Obligations [Member]
Operating Leases, Future Minimum Payments Due, Next Twelve Months		154,000
Operating Leases, Future Minimum Payments, Due in Two Years		112,000
Operating Leases, Future Minimum Payments, Due in Three Years		0
Capital Leases, Future Minimum Payments Due	76,000
Operating Leases, Future Minimum Payments Due		$ 266,000