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Note 4 - Investments - Schedule of Components of EAM's Investment Management Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Non-voting revenues interest in EAM |  | $ 7,195 | $ 7,211 | $ 7,346
EAM's net income (2) |  | 10,367 | 7,291 | 7,292
EAM Trust [Member] |  |  |  |
Investment management fees earned from the Value Line Funds, net of waivers shown below |  | 14,701 | 14,548 | 15,014
12b-1 fees and other fees, net of waivers shown below |  | 5,822 | 5,669 | 5,459
Other income/(loss) |  | 205 | (14) | 34
Investment management fee waivers and reimbursements (1) | [1] | 436 | 262 | 192
12b-1 fee waivers (1) | [1] | 923 | 1,071 | 1,518
Non-voting revenues interest in EAM |  | 7,195 | 7,211 | 7,346
EAM's net income (2) | [2] | $ 1,038 | $ 880 | $ 1,248
[1] | During fiscal 2017, 2016 and 2015 investment management fee waivers and reimbursements primarily related to one Value Line Mutual Fund and the 12b-1 fee waivers related to four of the Value Line Mutual Funds, respectively.
[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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: 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 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: 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(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 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(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + 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 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Represents the portion of revenue recognized on waiver of all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1. + References No definition available. + Details
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- Definition Represents the portion of revenue recognized on waiver of the investment management fees during the period. + References No definition available. + Details
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- Definition Represents the income received against non voting revenues in unconsolidated entity. + References No definition available. + Details
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