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Investments - Components of EAM's investment management operations (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Value Line's non-voting revenues interest | $ 1,862 valu_NonVotingRevenuesInterestInUnconsolidatedEntity |  | $ 1,767 valu_NonVotingRevenuesInterestInUnconsolidatedEntity |  | $ 5,498 valu_NonVotingRevenuesInterestInUnconsolidatedEntity |  | $ 5,028 valu_NonVotingRevenuesInterestInUnconsolidatedEntity |
EAM's net income | 2,177 us-gaap_NetIncomeLoss |  | 2,026 us-gaap_NetIncomeLoss |  | 6,195 us-gaap_NetIncomeLoss |  | 5,087 us-gaap_NetIncomeLoss |
EAM Trust |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Investment management fees earned from the Value Line Funds, net of fee waivers | 3,792 us-gaap_InvestmentAdvisoryFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 3,750 us-gaap_InvestmentAdvisoryFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 11,269 us-gaap_InvestmentAdvisoryFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 10,815 us-gaap_InvestmentAdvisoryFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |
12b-1 fees and other fees, net of fee waivers | 1,385 us-gaap_DistributionAndServicingFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 1,344 us-gaap_DistributionAndServicingFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 4,094 us-gaap_DistributionAndServicingFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 3,757 us-gaap_DistributionAndServicingFees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |
Other income | 4 us-gaap_OtherIncome / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 3 us-gaap_OtherIncome / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 13 us-gaap_OtherIncome / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 13 us-gaap_OtherIncome / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |
Investment management fee waivers | 74 valu_InvestmentManagementFeeWaiversAndReimbursements / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1] | 22 valu_InvestmentManagementFeeWaiversAndReimbursements / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1] | 143 valu_InvestmentManagementFeeWaiversAndReimbursements / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1] | 69 valu_InvestmentManagementFeeWaiversAndReimbursements / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1]
12b-1 fee waivers | 378 valu_FeeWaiverOnDistributionAndService12B1Fees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1] | 396 valu_FeeWaiverOnDistributionAndService12B1Fees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1] | 1,147 valu_FeeWaiverOnDistributionAndService12B1Fees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1] | 1,298 valu_FeeWaiverOnDistributionAndService12B1Fees / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [1]
Value Line's non-voting revenues interest | 1,862 valu_NonVotingRevenuesInterestInUnconsolidatedEntity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 1,767 valu_NonVotingRevenuesInterestInUnconsolidatedEntity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 5,498 valu_NonVotingRevenuesInterestInUnconsolidatedEntity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |  | 5,028 valu_NonVotingRevenuesInterestInUnconsolidatedEntity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember |
EAM's net income | $ 324 us-gaap_NetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [2] | $ 414 us-gaap_NetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [2] | $ 994 us-gaap_NetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [2] | $ 1,138 us-gaap_NetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = valu_EulavAssetManagementLlcMember | [2]
[1] | During fiscal 2015 and 2014, investment management fee waivers related primarily to one of the Value Line Fixed Income Mutual Funds. During fiscal 2015 and 2014, the 12b-1 fee waivers related primarily to six and seven 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.

X
- 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=31042434&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 -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: 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 6: 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 7: 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 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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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7 + 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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