ACQUISITIONS - Star Operating Companies (Details) - USD ($) $ in Thousands				1 Months Ended	4 Months Ended	12 Months Ended
	Aug. 22, 2025	Mar. 03, 2025	Aug. 09, 2024	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2025	Jul. 22, 2025	Dec. 31, 2024
Business Combination [Line Items]
Common stock, shares, issued (in shares)					5,366,000	5,366,000		4,033,000
Business combination measurement period adjustments	$ 1,705
Hudson common stock
Business Combination [Line Items]
Equity method investment, ownership percentage					21.00%	21.00%	10.00%
Excess of shares outstanding, percentage						5.00%
Star Equity Holdings, Inc.
Business Combination [Line Items]
Equity method investment, ownership percentage					27.00%	27.00%
Series A Preferred Stock
Business Combination [Line Items]
Preferred stock, dividend percentage			10.00%			10.00%
Star Operating Companies
Business Combination [Line Items]
Fair value of the common and preferred stock	32,174
Acquisition-related expense	1,600
Other current liabilities	896
Inventory	457
Accounts receivable, net	352
Litigation expenses	180
Sales tax liabilities	375
Professional fees	65
Current liabilities	428
State tax refund	$ 152
Payments to acquire businesses, gross		$ 1,000
Acquiree's revenue since acquisition date				$ 32,507
Acquiree's net earnings (loss) since acquisition date					$ 613
Star Operating Companies | Series A Preferred Stock
Business Combination [Line Items]
Automatically converted into the right to receive (in shares)	1
Preferred stock, dividend percentage	10.00%
Star Operating Companies | Common Stock
Business Combination [Line Items]
Automatically converted into the right to receive (in shares)	0.23
Common stockholders received shares (in shares)	744,291
Common stock, shares, issued (in shares)	0
Star Operating Companies | Preferred stock
Business Combination [Line Items]
Common stockholders received shares (in shares)	2,690,637