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Investments - Components of EAM's investment management operations (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Schedule of Investments [Line Items] |  |  |  |
Value Line's non-voting revenues interest |  | $ 7,346 | $ 6,767 | $ 5,781
EAM's net income |  | 7,292 | 6,768 | 6,619
EAM Trust |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment management fees earned from the Value Line Funds, net of waivers shown below |  | 15,014 | 14,452 | 12,773
12b-1 fees and other fees, net of waivers shown below |  | 5,459 | 5,061 | 3,905
Other income |  | 34 | 16 | 14
Investment management fee waivers and reimbursements | [1] | 192 | 89 | 379
12b-1 fee waivers | [1] | 1,518 | 1,683 | 2,156
Value Line's non-voting revenues interest |  | 7,346 | 6,767 | 5,781
EAM's net income | [2] | $ 1,248 | $ 1,464 | $ 945
[1] | During fiscal 2015 and 2014 investment management fee waivers and reimbursements primarily related to the Value Line Core Bond Fund and the 12b-1 fee waivers related to six and seven of the Value Line Mutual Funds, respectively. During fiscal 2013 investment management fee waivers and reimbursements related to the Value Line Core Bond Fund and the U.S. Government Money Market Fund ("USGMMF") which was merged into a third party fund, the Daily Income Fund, managed by Reich & Tang, effective October 19, 2012. In fiscal 2013 the 12b-1 fee waivers related to nine of the Value Line Mutual Funds. Subsequent to April 30, 2015, EAM changed its money market option to the Federated Government Obligations Fund which was added as an option for the direct Value Line Funds' shareholders to exchange into and is now available in place of the Daily Income Fund.
[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 Amount of fees from providing distribution and shareholder services. Distribution services include, but are not limited to, marketing and selling fund shares, advertising, printing and mailing of prospectuses and sales literature to investors. Shareholder services include, but are not limited to, answering shareholder inquiries and providing shareholders with investment information. + References No definition available. + Details
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- Definition Amount of fees earned from providing investment advice and research to customers. + 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 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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