REAL ESTATE INVENTORY: (Details Textual)	12 Months Ended
	Apr. 30, 2017 USD ($) a	Apr. 30, 2016 USD ($) a	Oct. 31, 2015 a
Real Estate Disclosure [Line Items]
Accumulated Capitalized Interest Costs	$ 4,039,000	$ 3,956,000
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,736,000	1,741,000
Cost of Real Estate Sales, Interest	5,000	6,000
Interest Costs Capitalized Adjustment	$ 83,000	$ 0
Area of Land | a	12,000	80	55,000
Other Revenue (Expense) from Real Estate Operations	$ 128,000	$ 128,000
Description Of Lessee Leasing For Royalty	The lessee has agreed to pay the Company a royalty on oil and gas produced from the property of 18.75% of the sales proceeds received by the lessee from the sale of such oil and gas and such royalty will be charged with 18.75% of any post-production costs associated with such oil and gas.