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Organization and Summary of Significant Accounting Policies (Detail Textuals) (USD $) In Thousands, except Per Share data, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2012 | Apr. 30, 2012 | Oct. 31, 2012 EAM Trust | Oct. 31, 2012 EAM Trust Minimum | Oct. 31, 2012 EAM Trust Maximum
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percent each voting profits interest of EAM managed by trustees |  |  | 20.00% |  |
Non-voting revenues interest ("Revenues Interest") |  |  |  | 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% |  |
U.S. government securities (in dollar per share) | $ 1 |  |  |  |
Short term investments (in dollars) | $ 7,044 | $ 10,848 |  |  |

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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 + Details
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- Definition Represents percentage of non-voting profits interest. + References No definition available. + Details
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- Definition Represents the par value of money market funds investement primarily in U.S. Government securities. + References No definition available. + Details
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- Definition Represents the stated percentage of non voting profits interests due from ex-subsidiary payable to parent under agreement. + References No definition available. + Details
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- Definition Amount represents voting profits interest of unconsolidated entity. + References No definition available. + Details
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