Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph g

-Article 7

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

Organization and Summary of Significant Accounting Policies (Detail Textuals) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2013 EAM Trust	Jul. 31, 2013 EAM Trust Minimum	Jul. 31, 2013 EAM Trust Maximum
Schedule of Equity Method Investments [Line Items]
Investment management fee revenues from its mutual fund and separate accounts business				41.00%	55.00%
Non-voting profits interest ("Profits Interest")			50.00%
Percentage of non voting profits interests due each quarter from EAM			90.00%
Short term investments (in dollars)	$ 3,758	$ 6,312