ACCOUNTS PAYABLE AND ACCRUED EXPENSES: (Details Textual) - USD ($)	Apr. 30, 2015	Apr. 30, 2014
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accrued Liabilities	$ 1,142,000	$ 1,445,000
Customer Postage Deposits Current And Noncurrent	4,832,000	5,669,000
Accounts Payable, Trade	1,641,000	1,622,000
Other Accounts Payable and Accrued Liabilities	$ 2,669,000	$ 3,703,000