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Investments - Equity Method Investment (Detail Textuals 1) - USD ($)		Jul. 31, 2015	Apr. 30, 2015
Schedule of Equity Method Investments [Line Items]
Investment in EAM Trust		$ 58,154,000	$ 58,048,000
EAM Trust
Schedule of Equity Method Investments [Line Items]
Investment in EAM Trust	[1]	58,154,000	58,048,000
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
[1] Reported within Long Term Assets on the Consolidated Condensed 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

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- Definition

Represents the cash and liquid securities in excess of working capital requirements contributed to capital account.

+ References

No definition available.

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- Definition

Represents the fair value of contributed capital at inception.

+ References

No definition available.

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