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Note 13 - Copyright Data Fees (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax | $ 9,051,000 | $ 8,989,000 | $ 18,022,000 | $ 17,903,000
Percentage of Copyright Data Fees |  |  | 14.20% |
Third Party Sponsored Assets for Copyright Data | 4,500,000,000 | 4,200,000,000 | $ 4,500,000,000 | 4,200,000,000
License [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 1,789,000 | $ 1,563,000 | $ 3,468,000 | $ 3,037,000

X
- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_LicenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |