ACCOUNTS PAYABLE AND ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	$ 7,035	$ 8,453
Fulfillment services [Member]
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	5,637	6,712
Real Estate Operations [Member]
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	1,138	1,464
Corporate Segment [Member]
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accounts payable, net and accrued expenses	$ 260	$ 277