v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Aug. 10, 2026
Document Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
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  
Entity Address, Address Line Two 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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   21,476,471
Entity Central Index Key 0001552198  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Stock    
Document Information    
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    
Title of 12(b) Security 7.875% Notes due 2028  
Trading Symbol WHFCL  
Security Exchange Name NASDAQ