Cover - USD ($)	12 Months Ended
	Jun. 30, 2021	Aug. 13, 2021	Dec. 31, 2020
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	1-367
Entity Registrant Name	STARRETT L S CO
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	04-1866480
Entity Address, Address Line One	121 Crescent Street
Entity Address, City or Town	Athol
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01331
City Area Code	978
Local Phone Number	249-3551
Title of 12(b) Security	Class A Common - $1.00 Per Share Par Value
Trading Symbol	SCX
Security Exchange Name	NYSE
Documents Incorporated by Reference	The Registrant intends to file a definitive Proxy Statement for the Company’s 2021 Annual Meeting of Stockholders within 120 days of the end of the fiscal year ended June 30, 2021. Portions of such Proxy Statement are incorporated by reference in Part III.
Entity Central Index Key	0000093676
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 26,731,773
Entity Shell Company	false
Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		6,484,295
Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		623,457