Note 7 - Related Party Transactions (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
Jan. 31, 2023	Jan. 31, 2022	Apr. 30, 2022
Revenue from Related Parties	$ 232,000	$ 243,000
Federal Income Tax Payments to Parent	$ 3,327,000	2,300,000
Ownership Percentage By Parent	91.47%
Value Line Inc [Member]
Accounts Receivable, Related Parties			$ 0
Value Line Inc [Member]
Accounts Receivable, Related Parties	$ 0
EAM Trust [Member]
Assets under Management, Carrying Amount	$ 3,040,000,000.00	$ 4,410,000,000
Percentage of Assets Increased (Decreased) in Unconsolidated Entities	31.10%
Non Voting Profits Interest Percent	50.00%		50.00%
Due from Related Parties, Total	$ 2,667,000
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%		90.00%
EAM Trust [Member] \| Maximum [Member]
Non Voting Revenues Interest Percent	55.00%		55.00%

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

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