FAIR VALUE MEASUREMENTS: (Details Textual) - USD ($)	Oct. 31, 2015	Apr. 30, 2015
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	$ 17,208,000	$ 18,090,000
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure	$ 15,772,000	$ 16,365,000