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Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($) | 12 Months Ended
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Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Minimum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |
Production Expenses Attributable to Additional Accelerated Amortization of Software Costs [Member] |  |  |
Capitalized Computer Software, Amortization | $ 1,239,000 |  |
Capitalized Computer Software, Additions | 1,681,000 | $ 2,422,000 |
Capitalized Software Development Costs for Project | 1,680,000 | 2,414,000 |
Capitalized Software Development Costs for New Systems | 1,000 | 8,000 |
Internal Costs to Develop Software | 1,250,000 | 1,692,000 |
Third Party Programmers Costs | 431,000 | 730,000 |
Capitalized Computer Software, Amortization | $ 3,520,000 | 2,421,000 | $ 1,812,000
Accelerated Write Off of Obsolete Software |  | $ 138,000 |

X
- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_CapitalizedComputerSoftwareAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for amortization of capitalized computer software costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount related to accelerated write off of obsolete software. + References No definition available. + Details
Name: | valu_AcceleratedWriteOffOfObsoleteSoftware
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the capitalized development cost for new system during the period. + References No definition available. + Details
Name: | valu_CapitalizedSoftwareDevelopmentCostsForNewSystems
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the capitalized development cost for project during the period. + References No definition available. + Details
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Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the internal costs to develop software. + References No definition available. + Details
Name: | valu_InternalCostsToDevelopSoftware
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the third party programmer costs. + References No definition available. + Details
Name: | valu_ThirdPartyProgrammersCosts
Namespace Prefix: | valu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |