Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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

- Definition

The initial percentage that the annual rent expenditure will be decreased by.

+ References

No definition available.

+ Details

Name:	valu_AnnualRentalExpenditureInitialDecreasePercentage
Namespace Prefix:	valu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents base rent increase amount.

+ References

No definition available.

+ Details

Name:	valu_BaseRentIncreaseAmount
Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents base rent increase percentage.

+ References

No definition available.

+ Details

Name:	valu_BaseRentIncreasePercent
Namespace Prefix:	valu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of allowance to be applied against the lessee's costs and expenses.

+ References

No definition available.

+ Details

Name:	valu_LesseeLeasingArrangementsAllowance
Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of free rent offered for six months accompanying an allowance arrangement.

+ References

No definition available.

+ Details

Name:	valu_LesseeLeasingArrangementsAllowanceSixMonthsOfFreeRentPayment
Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of base rent per annum during the period for an operating lease.

+ References

No definition available.

+ Details

Name:	valu_OperatingLeasesAnnualBaseRent
Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=valu_SubleaseToAmericanBuildingMaintenanceIndustriesIncorporatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=valu_SeagisPropertyGroupLpTheLandlordMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=valu_ValueLineDistributionCenterVldcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 9 - Lease Commitments (Details Textual)			12 Months Ended
Note 9 - Lease Commitments (Details Textual)	Nov. 30, 2016 USD ($) ft²	Feb. 29, 2016 USD ($) ft²	Apr. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)	Sep. 30, 2021 USD ($)
Operating Leases, Rent Expense, Total			$ 1,246,000	$ 1,677,000	$ 1,268,000
Sublease to American Building Maintenance Industries, Incorporated [Member]
Area of Real Estate Property \| ft²	24,726
Operating Leases, Annual Base Rent	$ 1,126,000
Base Rent Increase, Percent	2.25%
Security Deposit	$ 469,000
Annual Rental Expenditure, Initial, Decrease, Percentage	23.00%
Lessee Leasing Arrangements, Allowance	$ 417,000
Lessee Leasing Arrangements, Allowance, Six Months of Free Rent Payment	$ 563,000
Sublease to American Building Maintenance Industries, Incorporated [Member] \| Scenario, Forecast [Member]
Security Deposit						$ 305,000
Seagis Property Group LP (the "Landlord") [Member]
Area of Real Estate Property \| ft²		24,110
Seagis Property Group LP (the "Landlord") [Member] \| Value Line Distribution Center ("VLDC") [Member]
Area of Real Estate Property \| ft²		24,110
Operating Leases, Annual Base Rent		$ 192,880
Security Deposit		32,146
Base Rent Increase Amount		$ 237,218