DESCRIPTION OF BUSINESS	9 Months Ended
DESCRIPTION OF BUSINESS	Sep. 30, 2025
Description of Business [Abstract]
DESCRIPTION OF BUSINESS	DESCRIPTION OF BUSINESS Star Equity Holdings, Inc. (“Star Equity,” “Star”, the “Company,” “we,” or “our”) is a multi-industry diversified holding company with four divisions: Building Solutions, Business Services, Energy Services, and Investments. Our common stock and Series A preferred stock are listed on the NASDAQ Global Market exchange as “STRR” and “STRRP,” respectively. AMENDMENT TO CERTIFICATE OF INCORPORATION On September 4, 2025, Star Equity filed a certificate of amendment (the “Amendment”) to the Company’s Amended and Restated Certificate of Incorporation, as Amended (the “Charter”), to change the name of the Company from Hudson Global, Inc. to Star Equity Holdings, Inc. (the “Name Change”). The Name Change was approved by the Company’s Board of Directors (the “Board”) on September 2, 2025, and became effective at 12:01 a.m. (Eastern Time) on September 5, 2025. MERGER On August 22, 2025, Star Equity Holdings, Inc. ("Star", formerly known as Hudson Global, Inc. ("Hudson")), completed its previously announced acquisition of Star Operating Companies, Inc. ("SOC" or "Star Operating Companies", formerly known as Star Equity Holdings, Inc.) pursuant to the Agreement and Plan of Merger, dated as of May 21, 2025 (the “Merger Agreement”), by and among Star, SOC, and HSON Merger Sub, Inc., a wholly owned subsidiary of Star (“Merger Sub”). Upon the terms and subject to the conditions of the Merger Agreement, on August 22, 2025, at the effective time of the Merger (the “Effective Time”), Merger Sub merged with and into SOC, with SOC continuing as the surviving corporation of the Merger under the name “Star Operating Companies, Inc." as a wholly owned subsidiary of Star. Pursuant to the terms of the Merger Agreement, at the Effective Time, (i) each share of common stock of SOC issued and outstanding immediately prior to the Effective Time (other than certain shares as set forth in the Merger Agreement) was automatically converted into the right to receive 0.23 shares of Star common stock (the "exchange ratio") and (ii) each share of preferred stock of SOC issued and outstanding immediately prior to the Effective Time (other than certain shares set forth in the Merger Agreement) was automatically converted into the right to receive one (1) share of Star 10% Series A Cumulative Perpetual preferred stock (“Preferred Stock”). As a result of the Merger, former SOC common stockholders received approximately 744,291 shares of Star common stock for their SOC common shares and former SOC stockholders received approximately 2,690,637 shares of Preferred Stock. No fractional shares of Star common stock were issued in the Merger, and SOC stockholders became entitled to receive cash in lieu of fractional shares in accordance with the Merger Agreement. In addition, pursuant to the terms of the Merger Agreement, at the Effective Time, each award of SOC restricted stock units (“RSUs”) outstanding immediately prior to the Effective Time was converted into Star RSUs issued under the Hudson Global, Inc. 2009 Incentive Stock and Awards Plan, as amended (the “Plan”), in accordance with the Merger Agreement. The accompanying condensed consolidated financial statements include the financial results of SOC beginning on August 22, 2025 and reflect the post merger results of the Building Solutions, Energy Services, and Investments segments for the period from August 22, 2025 through September 30, 2025. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations. All significant intercompany accounts and transactions have been eliminated in consolidation. SEGMENTS Our Building Solutions segment is currently made up of the following operating businesses: KBS Builders, Inc. (“KBS”); EdgeBuilder, Inc. (“EdgeBuilder”), and Glenbrook Building Supply, Inc. (“Glenbrook”), with the latter two managed together and referred to jointly as “EBGL,” and Timber Technologies Solutions, Inc. (“TT”). KBS is based in Maine and manufactures modular buildings, typically in the single and multi-family residential segments, servicing principally the New England market. EBGL is based in the Minneapolis-Saint Paul area and principally serves the Upper Midwest region. EBGL manufactures and delivers structural wall panels for single and multi-family residential buildings, and other engineered wood-based products. EBGL also distributes building materials from two lumberyard locations primarily focused on professional builder customers. TT is based outside the Minneapolis-St. Paul area and manufactures glue-laminated timber products (“glulam”) for various end markets and applications, including agriculture, industrial, infrastructure, and building construction (commercial and residential). Our Business Services segment delivers Recruitment Process Outsourcing (“RPO”) services consisting of recruitment and contracting solutions tailored to the individual needs of primarily mid-to-large multinational companies. The Company operates directly in fifteen countries organized into three geographic regions: the Americas, Asia Pacific, and Europe, Middle East, and Africa ("EMEA"). The Company’s RPO delivery teams utilize recruitment process methodologies and project management expertise to meet clients’ ongoing business needs. The Company’s RPO services include complete recruitment outsourcing, project-based outsourcing, contingent workforce solutions, and recruitment consulting for clients’ permanent staff hires. Hudson’s RPO services leverage the Company’s consultants, supported by the Company’s specialists, in the delivery of its proprietary methods to identify, select, and engage the best-fit talent for critical client roles. In addition, the Company provides RPO clients with a range of outsourced professional contract staffing services and managed service provider services offered sometimes on a standalone basis and sometimes as part of a blended total talent solution. These services draw upon a combination of specialized recruiting and project management competencies to deliver a wide range of solutions. Hudson RPO-employed professionals - either individually or as a team - are placed with client organizations for a defined period of time based on specific business needs of the client. Our Energy Services segment currently consists of Alliance Drilling Tools, Inc. ("ADT"), a Wyoming and Texas based provider of drilling tools and services to the Energy industry, a key sector of the economy. ADT is a full-service downhole drilling tool company which provides sale and rental tools in the Oil & Gas, Geothermal, Mining, and Waterwells sectors. ADT is strategically located near premier oilfields in the Rockies, a geothermal and mining hub, and in Midland, TX within the Permian Basin. ADT’s business model allows for the majority of costs, such as freight, repairs, and damages to be passed directly to customers. Our Investments segment holds and manages certain of our corporate-owned real estate, including a manufacturing facility in Maine that is leased to KBS and a manufacturing facility in Wisconsin that is leased to TT. The Investments division manages internally funded, concentrated minority investments in a small number of public companies. It also holds and manages a promissory note and a private equity stake in Catalyst MedTech LLC ("Catalyst"), a provider of medical imaging equipment and services. SOC acquired these interests in May 2023 as a result of the sale of Digirad Health. Our Investments division also holds an investment in Enservco Corporation consisting of an investment in Enservco Common Stock, an investment in Enservco Preferred Stock, and an investment in a call option, all of which were acquired in the third quarter of 2024 and which currently have a carrying value of zero. See Note 17 to the Condensed Consolidated Financial Statements for further details regarding the Company’s reportable segments: Building Solutions, Business Services, Energy Services and Investments. ADOPTION OF ACCOUNTING POLICES PURSUANT TO MERGER The accounting policies of SOC have been conformed to those of the Company where necessary. No significant differences in accounting policies were identified. As a result of the acquisition, the Company adopted the following accounting policies that were not previously applicable to its operations: Fair Value of Financial Instruments The authoritative guidance for fair value measurements defines fair value for accounting purposes, establishes a framework for measuring fair value, and provides disclosure requirements regarding fair value measurements. The guidance defines fair value as an exit price, which is the price that would be received upon sale of an asset or paid upon transfer of a liability in an orderly transaction between market participants at the measurement date. The degree of judgment utilized in measuring the fair value of assets and liabilities generally correlates to the level of pricing observability. Financial instruments primarily consist of cash equivalents, equity securities, accounts receivable, other current assets, restricted cash, and accounts payable. The carrying amount of short-term and long-term debt and notes payable approximates fair value because of the relative short maturity of these instruments and interest rates we could currently obtain. The Company occasionally enters into derivative financial instruments to manage certain market risks. These derivative instruments are not designated as hedging instruments and accordingly, are recorded at fair value in the Condensed Consolidated Balance Sheets with changes in fair value recognized in cost of revenues in the Condensed Consolidated Statements of Operations. Equity Securities Securities consist of investments in equity securities that are publicly traded. These equity securities are measured at fair value on a trade date basis and changes in fair value are recognized in net income in other income (expense). Investments that are strategic in nature, with the intent to hold the investment over a several year period, are classified as long-term investments. Long-Term Investments As a part of the sale of Digirad Health, Star Operating Companies received common equity in Insignia TTG Parent LLC (“Catalyst Parent”), the parent entity of Catalyst formerly known as TTG Imaging Solutions, LLC. In accounting for this investment, we have elected the measurement alternative under ASC 321 “Accounting for Investments in Equity Securities”. The measurement alternative election allows for equity securities that do not have readily determinable fair values to be recorded at cost, with adjustments for impairment and certain observable price changes reflected in earnings. Such securities are adjusted to fair value when an observable price change occurs or impairment is identified. Each reporting period, we perform a qualitative and quantitative assessment considering impairment indicators to evaluate whether the investment is impaired. Impairment indicators include, but are not limited to, significant deterioration in earnings performance, significant adverse changes in the regulatory or economic environment and working capital deficiencies. If an investment is determined to be impaired, we include an impairment loss as a component of other income (expense) equal to the difference between the fair value of the investment and its carrying amount. During the period ended September 30, 2025 we recognized no impairment loss on this investment. On August 9, 2024, SOC completed an investment in Enservco Corporation (“Enservco”) (“Investment in Enservco”), which consisted of Enservco Common Stock, Enservco Preferred Stock, and certain other options reflected in the Share Exchange Agreement, and the Enservco Note Receivable (See Note 18, Supplementary Balance Sheet Information). The Investment in Enservco is required to be accounted for using the equity method of accounting under ASC 323, “Equity Method Investments and Joint Ventures”, as we are deemed to have significant influence over Enservco based upon GAAP rules. Pursuant to the guidance in ASC 323, we elected the fair value option pursuant to ASC 825-10-15, wherein the financial instrument is initially measured at estimated fair value as of the transaction issue date and then subsequently remeasured at estimated fair value as of each reporting period balance sheet date, with changes in the estimated fair value recognized as other income (expense) in the statement of operations. Enservco Common Stock is publicly traded, and the fair value is determined based on Enservco’s common stock close price as of the reporting date. The fair value of the Enservco Preferred Stock was based on the consideration of a number of objective and subjective factors, including third-party valuations and a company-specific economic outlook. To determine the fair value of the call option, the Company used the Black-Scholes option pricing model. The fair value of the Enservco Note was determined using a discounted cash flow model. Fair value assumptions are further described in Note 12, Fair Value Measurements. The Enservco Note was determined to be uncollectible as of December 31, 2024 and the value was reduced to $0. As described further in Note 18, Supplementary Balance Sheet Information, the value of the Enservco Note was fully collateralized and SOC called the collateral once it was determined that the note was in default. Inventory Inventories are valued using first-in, first-out, or the weighted-average inventory method; stated at the lower of cost or net realizable value. Finished goods and work-in-process inventory values include the cost of raw materials, labor, and manufacturing overhead. Inventory, when written down to net realizable value, establishes a new cost basis and its value is not subsequently increased based upon changes in underlying facts and circumstances. We also make adjustments to reduce the carrying amount of inventories for estimated excess or obsolete inventories. Factors influencing these adjustments include inventory on-hand compared with historical and estimated future sales and usage for new and existing products and assumptions about the likelihood of obsolescence. Debt Issuance Costs We incur debt issuance costs in connection with debt financings. Debt issuance costs for line of credit are presented in other assets and are amortized over the term of the revolving debt agreements using the straight-line method. Debt issuance costs for term debt are netted against the debt and are amortized over the term of the loan using the effective interest method. Amortization of debt issuance costs are included in interest expense. As of September 30, 2025 we have no unamortized debt issuance costs. Shipping and Handling Fees and Costs We record all shipping and handling costs billed to customers as revenue earned for the goods provided. Shipping and handling costs related to continuing operations are included in cost of revenues and totaled $164 for the period ended September 30, 2025. Warranties Within our Building Solutions division, KBS provides a limited assurance warranty on its residential homes that covers substantial defects in materials or workmanship for a period of 12 months after delivery to the owner. EBGL provides a limited warranty on the sale of its wood foundation products that covers leaks resulting from defects in workmanship for a period of 25 years. TT provides a limited warranty on glulam products for a period of 50 years. Estimated warranty costs are accrued in the period that the related revenue is recognized. See Note 18, Supplementary Balance Sheet Information, for further information. Advertising and Marketing Costs Advertising and marketing costs are expensed as incurred. Total advertising and marketing costs for the three and nine months ended September 30, 2025 were $913 and $2,814, respectively