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Cover
Aug. 02, 2022
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 02, 2022
Entity File Number 814-00802
Entity Registrant Name HORIZON TECHNOLOGY FINANCE CORPORATION
Entity Central Index Key 0001487428
Entity Tax Identification Number 27-2114934
Entity Incorporation, State or Country Code DE
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol HRZN
Security Exchange Name NASDAQ
4.875 Percentage Notes due 2026 [Member]  
Title of 12(b) Security 4.875% Notes due 2026
Trading Symbol HTFB
Security Exchange Name NYSE
6.25 Percentage Notes due 2027 [Member]  
Title of 12(b) Security 6.25% Notes due 2027
Trading Symbol HTFC
Security Exchange Name NYSE