Note 4 - Supplementary Cash Flow Information - Supplementary Cash Flow Elements (Details) - USD ($)	3 Months Ended
Jul. 31, 2017	Jul. 31, 2016
State and local income tax payments	$ 27,000	$ 375,000
Federal income tax payments to the Parent	$ 0	$ 268,000

Amount represents Federal income tax payments to the Parent.

No definition available.

Name:	valu_FederalIncomeTaxPaymentsToParent
Namespace Prefix:	valu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration