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Note 9 - Lease Commitments (Details Textual)			12 Months Ended
	Nov. 30, 2016 USD ($) ft²	Feb. 29, 2016 USD ($) ft²	Apr. 30, 2017 USD ($) ft²	Apr. 30, 2016 USD ($)	Apr. 30, 2015 USD ($)	Sep. 30, 2021 USD ($)
Operating Leases, Rent Expense			$ 1,677,000	$ 1,268,000	$ 1,268,000
Additional Short Term Overlapping Rent Expense			$ 86,000
Sublease to American Building Maintenance Industries, Incorporated [Member]
Annual Rental Expenditure, Initial, Decrease, Percentage	23.00%
Lessee Leasing Arrangements, Allowance	$ 417,000
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
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
Base Rent Increase Amount		237,218
Security Deposit		$ 32,146
Citibank, N.A. (The "Sublandlord") [Member]
Operating Lease Future Minimum Sublease Rental			$ 105,000

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the amount of additional short term overlapping rent expense 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

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

+ References

No definition available.

+ Details

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

X

- Definition

Represents base rent increase amount.

+ 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 base rent increase percentage.

+ References

No definition available.

+ Details

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

X

- 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

X

- Definition

Represents operating lease future minimum sublease rental.

+ References

No definition available.

+ Details

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Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=valu_ValueLineDistributionCenterVldcMember
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Period Type:

X

- Details

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Namespace Prefix:
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Period Type: