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CREDIT RISK (Details) (USD $) In Millions, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
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CREDIT RISK [Abstract] |  |
Amounts deposit not insured by FDIC | $ 29.6 | $ 15.1

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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration