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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Apr. 30, 2019
Percentage of Non Voting Revenues Interest in Unconsolidated Entity | 50.71% |  |
Ownership Percentage By Parent | 89.38% |  |
Value Line Inc [Member] |  |  |
Revenue from Related Parties | $ 75,000 | $ 73,000 |
Accounts Receivable, Related Parties | 0 | 0 |
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | $ 3,420,000,000 | $ 2,660,000,000 |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 28.60% |  |
Non Voting Profits Interest Percent | 50.00% |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable | $ 2,843,000 |  | $ 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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