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Organization and Summary of Significant Accounting Policies (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2015	Apr. 30, 2015
Schedule of Equity Method Investments [Line Items]
Cash equivalents	$ 5,605	$ 5,272
EAM Trust
Schedule of Equity Method Investments [Line Items]
Non-voting profits interest ("Profits Interest")	50.00%
Percentage of non voting profits interests due each quarter from EAM	90.00%
EAM Trust | Minimum
Schedule of Equity Method Investments [Line Items]
Percentage of non-voting revenues interest based on adjusted gross revenues	41.00%
EAM Trust | Maximum
Schedule of Equity Method Investments [Line Items]
Percentage of non-voting revenues interest based on adjusted gross revenues	55.00%

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Cash



-URI http://asc.fasb.org/extlink&oid=6506951



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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Cash Equivalents



-URI http://asc.fasb.org/extlink&oid=6507016

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