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Note 8 - Employees' Profit Sharing and Savings Plan (Details Textual) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Deferred Compensation Arrangement with Individual, Contributions by Employer	$ 345,000	$ 473,000	$ 422,000
Deferred Compensation Arrangement with Individual, Plan Reimbursement for Fees	$ 277,000

X

- Definition

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The reimbursement to a plan of fees received indirectly by the plan sponsor.

+ References

No definition available.

+ Details

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