DEFERRED REVENUE: (Details Textual)	1 Months Ended	12 Months Ended
	Sep. 30, 2014 USD ($)	Apr. 30, 2015 USD ($) a	Jul. 31, 2015 USD ($) a	Apr. 30, 2014 USD ($)
Deferred Revenue Arrangement [Line Items]
Area of Land | a		12,000
Deferred Revenue, Leases, Gross			$ 1,010,000
Lessee Leasing Arrangements, Operating Leases, Term of Contract		4 years
Description of Lessee Leasing Arrangements, Operating Leases		Lessee may extend the initial term of the Lease for an additional four years by paying ASW another payment of approximately $1,010,000.
Percentage Of Royalty Payments To Mortgage Holder	25.00%
Consent Fee	$ 100,000
Operating Leases, Income Statement, Lease Revenue		$ 152,000
Deferred Revenue, Leases, Net		758,000
Subsequent Event [Member]
Deferred Revenue Arrangement [Line Items]
Area of Land | a			55,000
El Dorado Utilities, Inc [Member]
Deferred Revenue Arrangement [Line Items]
Deferred Revenue, Leases, Net		$ 1,042,000		$ 1,157,000