OTHER LIABILITIES AND DEFERRED REVENUE; OTHER REVENUES (Details Textual) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Apr. 30, 2017
Other Liabilities		$ 3,000,000
Pre Tax Gain Included Other Revenues		1,318,000		$ 1,318,000	$ 0
Pre Tax Gain Included Deferred Revenues		302,000		302,000
Operating Leases, Income Statement, Lease Revenue		57,000		114,000
Deferred Revenue, Leases, Net	$ 189,000			189,000
Interest Payable		26,000
Gain (Loss) on Sale of Properties				0	1,496,000
Other Revenue, Net	86,000		$ 78,000	1,492,000	$ 1,738,000	$ 1,620,000
Payments For Liability Settlements		$ 163,000
Other Liabilities, Current	1,243,000			1,243,000
Deferred Revenue	$ 262,000			$ 262,000
Lease Expiration Date				Sep. 30, 2018