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Note 3 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Jan. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Revenue from Related Parties |  |  | $ 384,000 | $ 362,000 |
Federal Income Tax Payments to Parent |  |  | $ 2,700,000 | 3,975,000 | $ 6,824,000
Ownership Percentage By Parent | 89.34% |  | 89.34% |  |
Value Line Inc [Member] |  |  |  |  |
Accounts Receivable, Related Parties | $ 0 |  | $ 0 | 0 |
EAM Trust [Member] |  |  |  |  |
Assets under Management, Carrying Amount | $ 3,090,000,000 |  | 3,090,000,000 | 2,480,000,000 |
Increase (Decrease) in Assets under Management |  |  | $ 610,000,000 |  |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities |  |  | 24.60% |  |
Non Voting Profits Interest Percent |  | 50.00% | 50.00% |  |
Percentage of Non Voting Revenues Interest in Unconsolidated Entity | 50.31% |  |  |  |
Non Voting Profits Interest in Variable Entity Not yet Paid | $ 2,420,000 |  | $ 2,420,000 | $ 2,113,000 |
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% |  |
EAM Trust [Member] | Maximum [Member] |  |  |  |  |
Non Voting Revenues Interest Percent |  | 55.00% | 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=116637345&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=116634182&loc=SL114868664-224227 + Details
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