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Note 5 - Variable Interest Entity - Total Assets, the Maximum Exposure to Loss, and Value of the Assets and Liabilities in EAM (Details) - USD ($)		Apr. 30, 2019	Apr. 30, 2018
Equity Method Investments		$ 58,625,000	$ 58,233,000
EAM Trust [Member]
VIE Assets		60,683,000	60,203,000
Equity Method Investments	[1]	58,625,000	58,233,000
Value Line Liabilities
Value Line Liabilities		$ 58,625,000	$ 58,233,000
[1] Reported within Long-Term Assets on Consolidated 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
-Paragraph 25
-Subparagraph (a)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5710-111685

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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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
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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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Section 50
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