Cover Page - shares	6 Months Ended
	Jun. 30, 2025	Aug. 08, 2025
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2025
Document Transition Report	false
Entity File Number	001-35947
Entity Registrant Name	Star Equity Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	33-0145723
Entity Address, Address Line One	53 Forest Ave., 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, Outstanding		3,234,978
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Central Index Key	0000707388
Common Stock, par value $0.0001 per share
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	STRR
Security Exchange Name	NASDAQ
Series A Cumulative Perpetual Preferred Stock, par value $0.0001 per share
Entity Information [Line Items]
Title of 12(b) Security	Series A Cumulative Perpetual Preferred Stock, par value $0.0001 per share
Trading Symbol	STRRP
Security Exchange Name	NASDAQ
Series C Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Series C Participating Preferred Stock, par value$0.0001 per share Purchase Rights