Cover - shares	9 Months Ended
	Sep. 30, 2025	Oct. 31, 2025
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2025
Document Transition Report	false
Entity File Number	001-38704
Entity Registrant Name	STAR EQUITY HOLDINGS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	59-3547281
Entity Address, Address Line One	53 Forest Avenue
Entity Address, Address Line Two	Suite 101
Entity Address, City or Town	Old Greenwich
Entity Address, State or Province	CT
Entity Address, Postal Zip Code	06870
City Area Code	203
Local Phone Number	489-9500
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		3,435,903
Entity Central Index Key	0001210708
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Common stock | The NASDAQ Stock Market LLC
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	STRR
Security Exchange Name	NASDAQ
Series A Preferred Stock | The NASDAQ Stock Market LLC
Title of 12(b) Security	Series A Preferred Stock, $0.001 par value
Trading Symbol	STRRP
Security Exchange Name	NASDAQ
Preferred Share Purchase Rights
Title of 12(b) Security	Preferred Share Purchase Rights
No Trading Symbol Flag	true