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Note 3 - Related Party Transactions (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2015 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2014 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
EAM Trust [Member] | Value Line Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Value of Fund | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
EAM Trust [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non Voting Revenues Interest Percent |  |  |  |  |  |  |  |  |  | 41.00% |  |
Percentage of Non Voting Profits Interests Due from Ex Subsidiary Payable to Parent under Agreement |  |  |  |  |  |  |  |  |  | 90.00% |  |
EAM Trust [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Non Voting Revenues Interest Percent |  |  |  |  |  |  |  |  |  | 55.00% |  |
EAM Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets under Management, Carrying Amount |  | $ 2,200,000,000 |  |  |  | $ 2,400,000,000 |  |  |  | $ 2,200,000,000 | $ 2,400,000,000 |
Increase (Decrease) in Assets under Management |  |  |  |  |  |  |  |  |  | $ 128,000,000 |  |
Percentage of Assets Increased (Decreased) in Unconsolidated Entities |  |  |  |  |  |  |  |  |  | 5.40% |  |
Non Voting Profits Interest Percent |  |  |  |  |  |  |  |  |  | 50.00% |  |
Percentage of Non Voting Revenues Interest in Unconsolidated Entity |  | 49.97% | 50.14% | 50.16% | 50.05% | 49.87% | 49.80% | 49.63% | 49.18% |  |  |
Non Voting Profits Interest in Variable Entity Not yet Paid |  | $ 1,750,000 |  |  |  | $ 1,951,000 |  |  |  | $ 1,750,000 | 1,951,000 |
Ownership Percentage By Parent |  | 88.50% |  |  |  |  |  |  |  | 88.50% |  |
Value Line Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement Revenue |  |  |  |  |  |  |  |  |  | $ 164,000 | 171,000 |
Federal Income Tax Payments to Parent |  |  |  |  |  |  |  |  |  | $ 3,545,000 | $ 3,366,000 | $ 2,254,000

X
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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=63488584&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=68075638&loc=d3e60722-111653 + Details
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