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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2016 | Apr. 30, 2016
EAM Trust [Member] | Minimum [Member] |  |
Non Voting Revenues Interest Percent | 41.00% |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement | 90.00% |
EAM Trust [Member] | Maximum [Member] |  |
Non Voting Revenues Interest Percent | 55.00% |
EAM Trust [Member] |  |
Non Voting Profits Interest Percent | 50.00% |
Percent of Revenue Interest | 100.00% |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement | 90.00% |
Percent of Revenue Interest | 100.00% |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement | 90.00% |
Cash and Cash Equivalents, Fair Value Disclosure | $ 19,846,000 | $ 12,037,000

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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 + Details
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