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Investments - Components of EAM's investment management operations (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2012 | Oct. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Value Line's non-voting revenues interest |  |  |  |  | $ 2,808 |  | $ 2,821 |
Net income | 1,572 |  | 1,915 |  | 3,348 |  | 3,991 |
EAM Trust |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment management fees earned from the Value Line Funds, net of waivers shown below | 3,149 |  | 2,957 |  | 6,229 |  | 6,258 |
12b-1 fees, net of waivers shown below | 985 |  | 822 |  | 1,876 |  | 1,750 |
Other income |  |  | 5 |  |  |  | 9 |
Investment management fee waivers (1) | 167 | [1] | 227 | [1] | 346 | [1] | 457 | [1]
12b-1 fees waivers (1) | 547 | [1] | 548 | [1] | 1,088 | [1] | 1,166 | [1]
Value Line's non-voting revenues interest | 1,414 |  | 1,330 |  | 2,808 |  | 2,821 |
Net income | $ 230 | [2] | $ 26 | [2] | $ 388 | [2] | $ 188 | [2]
[1] | For the six months ended October 31, 2012, investment management fee waivers primarily related to the U.S. Government Money Market Fund ("USGMMF") and the 12b-1 fee waivers related to nine of the Value Line Mutual Funds. For the six months ended October 31, 2011, investment management fee waivers primarily related to the USGMMF and the 12b-1 fee waivers related to eleven of the Value Line Mutual Funds.
[2] | Represents EAM's net income, after giving effect to Value Line's non-voting revenues interest, but before distributions to voting profits interest holders and to the Company in respect of its 50% non-voting profits interest.

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- Definition Point-of-sale fee revenues (such as mutual fund front-end sales loads) and asset-based fee revenues (such as 12b-1 distribution and shareholder service fees) that are generally based on a contractual percentage of assets. Reported amounts also include fees earned from providing client or shareholder servicing, record keeping, or administrative services, and fees charged to cover certain types of expenses, including fund accounting fees, SEC filings and other maintenance costs. + References No definition available. + Details
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- Definition Fees earned for providing investment advice and research to customers. Such services may include the investment management of mutual funds and separate accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 9, 51, 59, 80 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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