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Consolidated Schedule of Investments (Unaudited) (Details Textual) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Jul. 31, 2023
Nov. 09, 2022
Debt Instrument, Face Amount $ 615.0 $ 615.0    
Percentage of Nonqualifying Assets on a Cost Basis 4.90% 4.70%    
Percentage of Nonqualifying Assets on a Fair Value Basis 1.50% 2.70%    
Investment, Unaffiliated Issuer [Member] | Software Sector [Member] | DropOff, Inc. [Member]        
Investment, Interest Rate, Paid in Kind 4.50% 4.50%    
Investment, Affiliated Issuer, Noncontrolled [Member] | Medical Device Sector [Member] | Aulea Medical Inc 1[Member]        
Investment Owned, Balance, Shares (in shares)     660,537  
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member] | Co-lender [Member]        
Investment Owned, Net Assets, Percentage   30.00%    
Horizon Technology Finance Corporation [Member] | Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]        
Investment Owned, Net Assets, Percentage 70.00% 70.00%    
Asset-backed Notes 2022 [Member]        
Debt Instrument, Face Amount $ 100.0 $ 100.0   $ 157.8
Asset-backed Notes 2022 [Member] | Affiliated Entity [Member]        
Debt Instrument, Face Amount       $ 100.0