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Investments - Equity Method Investment (Detail Textuals 1) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in EAM Trust |  | $ 58,048,000 | $ 57,850,000
EAM Trust |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment in EAM Trust | [1] | 58,048,000 | 57,850,000
Fair value of contributed capital at inception |  | 55,805,000 | 55,805,000
Cash and liquid securities in excess of working capital requirements contributed to capital account |  | $ 5,820,000 | $ 5,820,000
Non-voting profits interest ("Profits Interest") |  | 50.00% | 50.00%
Payable to VLI for its accrued non-voting revenues and non-voting profits interests |  | $ 1,951,000 | $ 1,887,000
[1] | Reported within Long Term Assets on Consolidated Balance Sheets.

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Sum of the carrying values as of the balance sheet date of accrued payable non-voting revenues and non-voting profits interests. + References No definition available. + Details
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