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Note 7 - Related Party Transactions (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Apr. 30, 2018
Federal Income Tax Payments to Parent			$ 1,300,000	$ 2,200,000
Ownership Percentage By Parent	89.11%		89.11%
Value Line Inc [Member]
Revenue from Related Parties			$ 188,000	179,000
Accounts Receivable, Related Parties	$ 0		0		$ 0
EAM Trust [Member]
Assets under Management, Carrying Amount	$ 2,570,000,000		$ 2,570,000,000	$ 2,510,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities			2.40%
Non Voting Profits Interest Percent			50.00%
Percentage of Non Voting Revenues Interest in Unconsolidated Entity	50.30%
Accrued Non Voting Revenues and Non Voting Profits Interests Payable	$ 2,317,000		$ 2,317,000		$ 2,113,000
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%

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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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