Document And Entity Information - shares	9 Months Ended
	Jan. 31, 2018	Mar. 12, 2018
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)		9,698,159
Document Type	10-Q
Document Period End Date	Jan. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Amendment Flag	false