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Related Party Transactions (Detail Textuals) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | May 31, 2012 | May 31, 2011 Value Line Inc | Apr. 30, 2013 Value Line Inc | Apr. 30, 2012 Value Line Inc | Apr. 30, 2011 Value Line Inc | Apr. 30, 2013 Value Line Inc Investment In EAM Trust | Apr. 30, 2012 Value Line Inc Investment In EAM Trust | Apr. 30, 2013 Value Line Inc Prepaid and refundable income taxes | Apr. 30, 2012 Value Line Inc Prepaid and refundable income taxes | Apr. 30, 2013 EAM Trust | Apr. 30, 2012 EAM Trust | Apr. 30, 2011 EAM Trust | Apr. 30, 2013 EAM Trust Minimum | Apr. 30, 2013 EAM Trust Maximum
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets of value line funds managed by EAM |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  | $ 2,190,000,000 | $ 2,110,000,000 | $ 2,240,000,000 |  |
Increase in the value of assets managed by EAM |  |  |  |  |  |  |  |  |  |  |  |  | 73,000,000 | 132,000,000 |  |  |
Percentage of assets increased in funds |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% | 5.90% |  |  |
Percentage of non voting profits interests due each quarter from EAM |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |
Non voting profits interest in variable entity not yet paid |  |  |  |  |  |  |  |  | 1,621,000 | 497,000 |  |  |  |  |  |  |
Investment management fee revenues from its mutual fund and separate accounts business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41.00% | 55.00%
Rental and accounting and other administrative support service income |  |  |  |  | 44,000 |  |  |  |  |  |  |  |  |  |  |  |
Reimbursed income |  |  |  |  |  | 220,000 | 268,000 | 356,000 |  |  |  |  |  |  |  |  |
Federal income tax payments to the Parent | (1,877,000) | (845,000) | (348,000) |  |  | 1,877,000 | 845,000 | 348,000 |  |  |  |  |  |  |  |  |
Prepaid and refundable income taxes |  | $ 779,000 |  |  |  |  |  |  |  |  | $ 0 | $ 530,000 |  |  |  |  |
Percentage of ownership in outstanding shares of common stock of the Company by parent |  |  |  |  |  | 87.40% |  |  |  |  |  |  |  |  |  |  |

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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60722-111653 + Details
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- Definition Amount represents Federal income tax payments to the Parent. + References No definition available. + Details
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- Definition Represents distributable amounts earned through the balance sheet date, which is included in the Investment in variable interest entity and not yet paid. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer. It also includes carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. + References No definition available. + Details
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