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Organization and Summary of Significant Accounting Policies (Detail Textuals) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2012	Apr. 30, 2012
Organization, Consolidation and Presentation Of Financial Statements [Abstract]
U.S. government securities (in dollar per share)	$ 1
Short term investments (in dollars)	$ 8,702	$ 10,848

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- Details

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- Definition

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.

+ References

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

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- Definition

Represents the par value of money market funds investement primarily in U.S. Government securities.

+ References

No definition available.

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