Document And Entity Information - shares	3 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Document Information [Line Items]
Entity Registrant Name	STARRETT L S CO
Entity Central Index Key	0000093676
Trading Symbol	scx
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		760,717
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		6,236,867