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Selected Quarterly Financial Data - Summary of Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
 [2]
Dec. 31, 2020
 [2]
Quarterly Financial Data [Abstract]                          
Total interest and related portfolio income $ 14,392 $ 15,177 $ 16,337 $ 16,526 $ 17,788 $ 18,574 $ 19,626 $ 20,327          
Net investment income 5,539 5,802 6,477 6,226 11,163 [1] 7,166 [1] 7,915 [1] 8,529 [1]          
Net (decrease) increase in net assets resulting from operations $ (2,540) $ (1,509) $ (6,372) $ 4,486 $ 6,995 $ 7,445 $ (3,114) $ 55 $ (5,935) $ 11,381 $ (20,996)    
Net increase (decrease) in net assets resulting from operations per share - basic $ (0.28) $ (0.16) $ (0.69) $ 0.48 $ 0.74 $ 0.78 $ (0.33) $ 0.01 $ (0.64) [2] $ 1.2 [2] $ (2.18) [2] $ 3.05 $ 6.32
Net increase (decrease) in net assets resulting from operations per share - diluted (0.28) (0.16) (0.69) 0.48 0.74 0.78 (0.33) 0.01 (0.64) 1.2 (2.18)    
Net investment income per share - basic and diluted $ 0.6 $ 0.63 $ 0.7 $ 0.67 $ 1.19 $ 0.75 $ 0.83 $ 0.89 $ 2.59 [2],[3] $ 3.66 [2],[3] $ 3 [2],[3] $ 4.92 [3] $ 3.4 [3]
[1] Excluding the impact of the expense reimbursement while also excluding the secondary impact that the reimbursement had on other expenses, such as incentive fees, of approximately $4.4 million in Q4 2023, the net investment income would have been $6.8 million.
[2] Totals may not sum due to rounding.
[3] Based on weighted average number of common shares outstanding for the period.