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Debt - Information about Senior Securities (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
SBA Debentures                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities $ 175,000 $ 210,000 $ 153,000 $ 107,000 $ 147,000 $ 157,500 $ 191,000 $ 231,300 $ 224,000 $ 213,500
Credit Facility                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities $ 45,000         $ 25,000 $ 36,500 $ 11,500   $ 15,500
Asset Coverage per Unit $ 3,124 $ 3,217 $ 2,800 $ 2,822 $ 2,337 $ 2,989 $ 5,659 $ 35,198   $ 16,959
2023 Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities         $ 50,000 $ 50,000 $ 50,000      
Asset Coverage per Unit         $ 2,337 $ 2,989 $ 5,659      
Average Market Value per Unit         $ 24.12 $ 25.81 $ 25.74      
February 2024 Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities         $ 69,000 $ 69,000        
Asset Coverage per Unit         $ 2,337 $ 2,989        
Average Market Value per Unit         $ 24.6 $ 25.97        
November 2024 Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities         $ 63,250 $ 63,250        
Asset Coverage per Unit         $ 2,337 $ 2,989        
Average Market Value per Unit         $ 23.2 $ 25.75        
January 2026 Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities $ 125,000 $ 125,000 $ 125,000 $ 125,000 $ 125,000          
Asset Coverage per Unit $ 3,124 $ 3,217 $ 2,800 $ 2,822 $ 2,337          
November 2026 Notes                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities $ 125,000 $ 125,000 $ 125,000 $ 125,000            
Asset Coverage per Unit $ 3,124 $ 3,217 $ 2,800 $ 2,822            
Secured Borrowings                    
Debt Instrument [Line Items]                    
Total Amount Outstanding Exclusive of Treasury Securities $ 13,674 $ 15,880 $ 16,880 $ 17,637            
Asset Coverage per Unit $ 3,124 $ 3,217 $ 2,800 $ 2,822