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Note 13 - Restricted Cash and Deposits (Details Textual) - USD ($) | Oct. 31, 2017 | Apr. 30, 2017
--- | --- | ---
Restricted Investments, Noncurrent | $ 469,000 | $ 469,000
Cash Securing a Letter of Credit Issued as Security Deposit [Member] |  |
Security Deposit | $ 469,000 |

X
- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. + References No definition available. + Details
Name: | us-gaap_RestrictedInvestmentsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis=valu_CashSecuringALetterOfCreditIssuedAsSecurityDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |