OTHER REVENUES (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Other Revenues [Line Items]
Operating Leases, Income Statement, Lease Revenue	$ 57,000	$ 171,000	$ 57,000	$ 171,000
Deferred Revenue, Leases, Net	$ 360,000		360,000
Building [Member]
Other Revenues [Line Items]
Gain (Loss) on Sale of Properties			$ 1,496,000