Document And Entity Information - USD ($)	12 Months Ended
	Apr. 30, 2018	Jun. 30, 2018	Oct. 31, 2017
Document Information [Line Items]
Entity Registrant Name	VALUE LINE INC
Entity Central Index Key	0000717720
Trading Symbol	valu
Current Fiscal Year End Date	--04-30
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		9,689,334
Entity Public Float			$ 19,125,609
Document Type	10-K
Document Period End Date	Apr. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false