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Note 7 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Apr. 30, 2018
Ownership Percentage By Parent | 89.11% |  |
Value Line Inc [Member] |  |  |
Revenue from Related Parties | $ 73,000 | $ 70,000 |
Accounts Receivable, Related Parties | 0 |  | $ 0
EAM Trust [Member] |  |  |
Assets under Management, Carrying Amount | $ 2,660,000,000 | $ 2,490,000,000 |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities | 7.00% |  |
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 | $ 2,279,000 |  | $ 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% |  |

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