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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Net Cash Provided by (Used in) Operating Activities, Total |  | $ 11,831,000 | $ 9,857,000 | $ 4,036,000
Money Market Funds, at Carrying Value |  | 5,617,000 | 4,982,000 |
Net Cash Provided by (Used in) Investing Activities, Total |  | (3,309,000) | (1,190,000) | $ (2,775,000)
Accounting Standards Update 2016-15 [Member] |  |  |  |
Net Cash Provided by (Used in) Operating Activities, Total |  | 9,300,000 | 8,800,000 |
Net Cash Provided by (Used in) Investing Activities, Total |  | $ (9,300,000) | $ (8,800,000) |
EAM Trust [Member] |  |  |  |
Non Voting Profits Interest Percent | 50.00% | 50.00% |  |
EAM Trust [Member] | Minimum [Member] |  |  |  |
Non Voting Revenues Interest Percent | 41.00% | 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% | 55.00% |  |

X
- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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