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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 11, 2026
Jun. 30, 2025
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-35730    
Entity Registrant Name Stellus Capital Investment Corp    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 46-0937320    
Entity Address, Address Line One 4400 Post Oak Parkway    
Entity Address, Adress Line Two Suite 2200,    
Entity Address, City or Town Houston    
Entity Address State Or Province TX    
Entity Address, Postal Zip Code 77027    
City Area Code 713    
Local Phone Number 292-5400    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol SCM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 371,895,297
Entity Common Stock, Shares Outstanding   28,947,254  
Documents Incorporated by Reference [Text Block]

Portions of the registrant’s definitive Proxy Statement relating to the registrant’s 2026 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission within 120 days following the end of the registrant’s fiscal year, are incorporated by reference in Part III of this Annual Report on Form 10-K as indicated herein.

    
Entity Central Index Key 0001551901    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Deloitte & Touche LLP    
Auditor Location Houston, Texas    
Auditor Firm ID 34