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Note 19 - Paycheck Protection Program Loan (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Proceeds from Issuance of Long-term Debt, Total |  | $ 2,331,000 |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |
Proceeds from Issuance of Long-term Debt, Total | $ 2,331,365 |  |  |

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DebtInstrumentAxis=valu_PaycheckProtectionProgramCaresActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |