ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details Textual) - USD ($)	Jul. 31, 2017	Apr. 30, 2017
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accrued Liabilities	$ 1,494,000	$ 1,669,000
Customer Postage Deposits Current And Noncurrent	3,112,000	3,178,000
Accounts Payable, Trade	631,000	619,000
Other Accounts Payable and Accrued Liabilities	$ 1,252,000	$ 1,569,000