COMMITMENTS AND CONTINGENCIES: (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Commitments And Contingencies [Line Items]
Operating Leases, Rent Expense	$ 314,000	$ 123,000
Operating Leases, Future Minimum Payments Due	912,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	858,000
Operating Leases, Future Minimum Payments, Due in Three Years	1,000
Operating Leases, Future Minimum Payments, Due Thereafter	0
Future Development Commitments	1,945,000
Operating Leases, Future Minimum Payments, Due in Two Years	$ 53,000