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Note 3 - Variable Interest Entity - Total Assets, the Maximum Exposure to Loss, and Value of the Assets and Liabilities in EAM (Details) - USD ($)		Oct. 31, 2018	Apr. 30, 2018
Equity Method Investments		$ 58,451,000	$ 58,233,000
EAM Trust [Member]
VIE Assets		60,284,000	60,203,000
Equity Method Investments	[1]	58,451,000	58,233,000
Value Line Liabilities
Value Line Liabilities		$ 58,451,000	$ 58,233,000
[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 10
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X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

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-Name Accounting Standards Codification
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-Section 50
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X

- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

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-Publisher FASB
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-Section 50
-Paragraph 3
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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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