DEFERRED REVENUE (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Apr. 30, 2016	Apr. 30, 2015
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Leases, Gross	$ 910,000		$ 910,000
Operating Leases, Income Statement, Lease Revenue	57,000	$ 57,000	171,000	$ 95,000
Deferred Revenue, Leases, Net	587,000		587,000
Real Estate Operations and Corporate General and Administrative Expenses	872,000	$ 1,048,000	2,837,000	$ 2,693,000
Warehouse [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Gain on Sale of Property					$ 251,000
El Dorado Utilities, Inc [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Leases, Net	955,000		955,000			$ 1,042,000
Real Estate Operations and Corporate General and Administrative Expenses	$ 29,000		$ 87,000