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Related Party Transactions (Detail Textuals) (USD $) | 9 Months Ended |  |  |  |  | 9 Months Ended | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2013 EAM Trust | Apr. 30, 2012 EAM Trust | Jan. 31, 2012 EAM Trust | Jan. 31, 2013 EAM Trust Minimum | Jan. 31, 2013 EAM Trust Maximum | May 31, 2011 Value Line Inc | Jan. 31, 2013 Value Line Inc | Jan. 31, 2013 Arnold Bernhard and Co Inc | Jan. 31, 2012 Arnold Bernhard and Co Inc | Apr. 30, 2012 Arnold Bernhard and Co Inc
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets of value line funds managed by EAM |  |  |  | $ 2,130,000,000 |  | $ 2,080,000,000 |  |  |  |  |  |  |
Percentage of assets decreased in funds |  |  |  | 2.60% |  |  |  |  |  |  |  |  |
Percentage of non voting profits interests due each quarter from EAM |  |  |  |  |  |  |  |  |  | 90.00% |  |  |
Non voting profits interest in variable entity not yet paid |  |  |  | 1,588,000 | 497,000 |  |  |  |  |  |  |  |
Non-voting revenues interest ("Revenues Interest") |  |  |  |  |  |  | 41.00% | 55.00% |  |  |  |  |
Rental and accounting and other administrative support service income |  |  |  |  |  |  |  |  | 44,000 |  |  |  |
Reimbursed income |  |  |  |  |  |  |  |  |  |  | 138,000 | 167,000 |
Federal income tax payments to the Parent | (1,030,000) | (245,000) |  |  |  |  |  |  |  |  | 1,030,000 | 245,000 |
Prepaid and refundable income taxes |  |  | $ 779,000 |  |  |  |  |  |  |  | $ 0 |  | $ 530,000
Percentage of ownership of parent company | 87.40% |  |  |  |  |  |  |  |  |  |  |  |

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