v3.25.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --12-31    
Entity File Number 814-00967    
Entity Registrant Name WHITEHORSE FINANCE, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-4247759    
Entity Address, Address Line One 1450 Brickell Avenue, 31st Floor    
Entity Address, City or Town Miami    
Entity Address State Or Province FL    
Entity Address, Postal Zip Code 33131    
City Area Code 305    
Local Phone Number 381-6999    
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     $ 224.2
Entity Common Stock, Shares Outstanding   23,243,088  
Entity Central Index Key 0001552198    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Crowe LLP    
Auditor Location Costa Mesa, California    
Auditor Firm ID 173    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol WHF    
Security Exchange Name NASDAQ    
7.875% 2028 Notes      
Document Information [Line Items]      
Title of 12(b) Security 7.875% Notes due 2028    
Trading Symbol WHFCL    
Security Exchange Name NASDAQ