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Note 14 - Copyright Data Fees (Details Textual) | 12 Months Ended
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Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($)
Third Party Sponsored Assets for Copyright Data | $ 3,600,000,000 | $ 1,800,000,000 |
Licenses Revenue | $ 4,406,000 | $ 2,621,000 | $ 2,847,000
Percentage of Copyright Data Fees | 68.00% |  |
Number of Contracts for Copyright Data | 3 | 3 |

X
- Definition Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. + 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(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_LicensesRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents number of contracts for copyright data. + References No definition available. + Details
Name: | valu_NumberOfContractsForCopyrightData
Namespace Prefix: | valu_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of copyright data fees during the period. + References No definition available. + Details
Name: | valu_PercentageOfCopyrightDataFees
Namespace Prefix: | valu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents amount of third party sponsored assets for copyright data. + References No definition available. + Details
Name: | valu_ThirdPartySponsoredAssetsForCopyrightData
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant