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Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	6 Months Ended
	Jul. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Apr. 30, 2018
Net Cash Provided by (Used in) Operating Activities, Total		$ 3,604,000	$ 3,169,000
Net Cash Provided by (Used in) Investing Activities, Total		(1,232,000)	(1,720,000)
Money Market Funds, at Carrying Value		3,726,000		$ 4,982,000
Accounting Standards Update 2016-15 [Member]
Net Cash Provided by (Used in) Operating Activities, Total		4,700,000	4,400,000
Net Cash Provided by (Used in) Investing Activities, Total		$ (4,700,000)	$ (4,400,000)
EAM Trust [Member]
Non Voting Profits Interest Percent		50.00%
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%	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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
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