CREDIT RISK (Details) - USD ($) $ in Millions	Apr. 30, 2017	Apr. 30, 2016
CREDIT RISK [Abstract]
Amounts deposit not insured by FDIC	$ 6.0	$ 36.7

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

No definition available.

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant