FAIR VALUE MEASUREMENTS: (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes and Loans, Noncurrent, Total		$ 12,384,000
Asset Impairment Charges, Total	$ 150,000	10,406,000
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value Disclosure		11,102,000
Fulfillment Services [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges, Total	0	7,900,000
Real Estate Operations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges, Total	$ 150,000	$ 2,506,000