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Note 3 - Related Party Transactions (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Revenue from Related Parties | $ 388,000 | $ 384,000 |
Federal Income Tax Payments to Parent | $ 3,325,000 | 2,700,000 | $ 3,975,000
Ownership Percentage By Parent | 89.78% |  |
Value Line Inc [Member] |  |  |
Accounts Receivable, Related Parties | $ 0 | 0 |
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | 3,580,000,000 | 3,090,000,000 |
Increase (Decrease) in Assets under Management | $ 485,000,000 |  |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 15.70% |  |
Non Voting Profits Interest Percent | 50.00% |  |
Percentage of Non Voting Revenues Interest in Unconsolidated Entity | 51.51% |  |
Non Voting Profits Interest in Variable Entity Not yet Paid | $ 2,949,000 | $ 2,420,000 |
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% |  |

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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=120401555&loc=SL114874292-224272 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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