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Related Party Transactions (Detail Textuals) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2014 | Jan. 31, 2014 | Oct. 31, 2013 | Jul. 31, 2013 | Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Federal income tax payments to the Parent |  |  |  |  |  |  |  |  |  | $ 3,366,000 | $ 2,254,000 | $ 1,877,000
Value Line Inc |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Reimbursed income |  |  |  |  |  |  |  |  |  | 171,000 | 220,000 |
EAM Trust |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total assets of value line funds managed by EAM |  | $ 2,400,000,000 |  |  |  | $ 2,350,000,000 |  |  |  | 2,400,000,000 | 2,350,000,000 |
Increase in the value of assets managed by EAM |  |  |  |  |  |  |  |  |  | $ 46,000,000 |  |
Percentage of assets increased in funds |  |  |  |  |  |  |  |  |  | 2.00% |  |
Non-voting profits interest in EAM |  |  |  |  |  |  |  |  |  | 50.00% |  |
Non voting profits interest in variable entity not yet paid |  | $ 1,951,000 |  |  |  | $ 1,887,000 |  |  |  | $ 1,951,000 | $ 1,887,000 |
Percentage of ownership in outstanding shares of common stock of the Company by parent |  | 88.00% |  |  |  |  |  |  |  | 88.00% |  |
Percentage of non-voting revenues interest in unconsolidated entity |  | 49.87% | 49.80% | 49.63% | 49.18% | 48.66% | 47.91% | 47.27% | 46.66% |  |  |
EAM Trust | Value Line Inc |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of fund | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
EAM Trust | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of non voting profits interests due each quarter from EAM |  |  |  |  |  |  |  |  |  | 90.00% |  |
Investment management fee revenues from its mutual fund and separate accounts business |  |  |  |  |  |  |  |  |  | 41.00% |  |
EAM Trust | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment management fee revenues from its mutual fund and separate accounts business |  |  |  |  |  |  |  |  |  | 55.00% |  |

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