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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 26, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Securities Act File Number 814-00813    
Entity Registrant Name OFS Capital Corporation    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-1339639    
Entity Address, Address Line One 222 W. Adams Street    
Entity Address, Address Line Two Suite 1850    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60606    
City Area Code 847    
Local Phone Number 734-2000    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 87.5
Entity Common Stock, Shares Outstanding   13,398,078  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement relating to the registrant’s 2026 Annual Meeting of Stockholders, to be filed pursuant to Regulation 14A with the Securities and Exchange Commission, are incorporated by reference in Part III of this Annual Report on Form 10-K as indicated herein.
    
Entity Central Index Key 0001487918    
Amendment Flag false    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Common Stock, $0.01 par value per share      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, $0.01 par value per share    
Trading Symbol OFS    
Security Exchange Name NASDAQ    
4.95% Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security 4.95% Notes due 2028    
Trading Symbol OFSSH    
Security Exchange Name NASDAQ    
7.50% Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security 7.50% Notes due 2028    
Trading Symbol OFSSO    
Security Exchange Name NASDAQ