XML 11 R1.htm IDEA: XBRL DOCUMENT v3.23.2
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2023
Aug. 01, 2023
Document Information [Line Items]    
Entity Central Index Key 0001487428  
Entity Registrant Name Horizon Technology Finance Corp  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2023  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2023  
Document Transition Report false  
Entity File Number 814-00802  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 27-2114934  
Entity Address, Address Line One 312 Farmington Avenue  
Entity Address, City or Town Farmington  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06032  
City Area Code 860  
Local Phone Number 676‑8654  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   32,103,683
The 6.25% Notes due 2027 [Member]    
Document Information [Line Items]    
Title of 12(b) Security 6.25% Notes due 2027  
Trading Symbol HTFC  
Security Exchange Name NYSE  
The 4.875% Notes due 2026 [Member]    
Document Information [Line Items]    
Title of 12(b) Security 4.875% Notes due 2026  
Trading Symbol HTFB  
Security Exchange Name NYSE  
Common Stock [Member]    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol HRZN  
Security Exchange Name NASDAQ