ACCOUNTS PAYABLE AND ACCRUED EXPENSES (Details Textual) - USD ($)	Oct. 31, 2017	Apr. 30, 2017
Accounts Payable and Accrued Liabilities Disclosure [Line Items]
Accrued Liabilities	$ 1,665,000	$ 1,669,000
Customer Postage Deposits Current And Noncurrent	2,690,000	3,178,000
Accounts Payable, Trade	1,127,000	619,000
Other Accounts Payable and Accrued Liabilities	$ 1,789,000	$ 1,569,000